BaseIterateeSuite

Class that supports the registration of a “subject” being specified and tested via the instance referenced from AnyFlatSpec's behavior field.

This field enables syntax such as the following subject registration:

behavior of "A Stack"
^

For more information and examples of the use of the behavior field, see the main documentation for trait AnyFlatSpec.

Class used via an implicit conversion to enable two objects to be compared with === and !== with a Boolean result and an enforced type constraint between two object types. For example:

assert(a === b)
assert(c !== d)

You can also check numeric values against another with a tolerance. Here are some examples:

assert(a === (2.0 +- 0.1))
assert(c !== (2.0 +- 0.1))

Performs a configured property checks by applying property check functions passed to its apply methods to arguments supplied by implicitly passed generators, modifying the values in the PropertyGenConfig object passed implicitly to its apply methods with parameter values passed to its constructor.

Instances of this class are returned by trait ScalaCheckDrivenPropertyChecks forAll method that accepts a variable length argument list of PropertyCheckConfigParam objects. Thus it is used with functions of all six arities. Here are some examples:

forAll (minSize(1), sizeRange(9)) { (a: String) =>
 a.length should equal ((a).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

In the first example above, the ConfiguredPropertyCheck object is returned by:

forAll (minSize(1), sizeRange(9))

The code that follows is an invocation of one of the ConfiguredPropertyCheck apply methods:

{ (a: String) =>
 a.length should equal ((a).length)
}

Class used via an implicit conversion to enable any two objects to be compared with === and !== with a Boolean result and no enforced type constraint between two object types. For example:

assert(a === b)
assert(c !== d)

You can also check numeric values against another with a tolerance. Here are some examples:

assert(a === (2.0 +- 0.1))
assert(c !== (2.0 +- 0.1))

Class that supports registration of ignored tests via the IgnoreWord instance referenced from AnyFlatSpec's ignore field.

This class enables syntax such as the following registration of an ignored test:

ignore should "pop values in last-in-first-out order" in { ... }
                                                     ^

In addition, it enables syntax such as the following registration of an ignored, pending test:

ignore should "pop values in last-in-first-out order" is (pending)
                                                     ^

Note: the is method is provided for completeness and design symmetry, given there's no way to prevent changing is to ignore and marking a pending test as ignored that way. Although it isn't clear why someone would want to mark a pending test as ignored, it can be done.

And finally, it also enables syntax such as the following ignored, tagged test registration:

ignore should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                     ^

For more information and examples of the use of the ignore field, see the Ignored tests section in the main documentation for trait AnyFlatSpec.

Class that supports registration of ignored, tagged tests via the IgnoreWord instance referenced from AnyFlatSpec's ignore field.

This class enables syntax such as the following registration of an ignored, tagged test:

ignore should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                                        ^

In addition, it enables syntax such as the following registration of an ignored, tagged, pending test:

ignore should "pop values in last-in-first-out order" taggedAs(SlowTest) is (pending)
                                                                        ^

Note: the is method is provided for completeness and design symmetry, given there's no way to prevent changing is to ignore and marking a pending test as ignored that way. Although it isn't clear why someone would want to mark a pending test as ignored, it can be done.

For more information and examples of the use of the ignore field, see the Ignored tests section in the main documentation for trait AnyFlatSpec. For examples of tagged test registration, see the Tagging tests section in the main documentation for trait AnyFlatSpec.

Class that supports registration of ignored tests via the ItWord instance referenced from AnyFlatSpec's ignore field.

This class enables syntax such as the following registration of an ignored test:

ignore should "pop values in last-in-first-out order" in { ... }
^

For more information and examples of the use of the ignore field, see Ignored tests section in the main documentation for this trait.

Class that supports test registration in shorthand form.

For example, this class enables syntax such as the following test registration in shorthand form:

"A Stack (when empty)" should "be empty" in { ... }
                                        ^

This class also enables syntax such as the following ignored test registration in shorthand form:

"A Stack (when empty)" should "be empty" ignore { ... }
                                        ^

This class is used via an implicit conversion (named convertToInAndIgnoreMethods) from ResultOfStringPassedToVerb. The ResultOfStringPassedToVerb class does not declare any methods named in, because the type passed to in differs in a AnyFlatSpec and a FixtureAnyFlatSpec. A FixtureAnyFlatSpec needs two in methods, one that takes a no-arg test function and another that takes a one-arg test function (a test that takes a Fixture as its parameter). By constrast, a AnyFlatSpec needs only one in method that takes a by-name parameter. As a result, AnyFlatSpec and FixtureAnyFlatSpec each provide an implicit conversion from ResultOfStringPassedToVerb to a type that provides the appropriate in methods.

Class that supports tagged test registration in shorthand form.

For example, this class enables syntax such as the following tagged test registration in shorthand form:

"A Stack (when empty)" should "be empty" taggedAs() in { ... }
                                                   ^

This class also enables syntax such as the following tagged, ignored test registration in shorthand form:

"A Stack (when empty)" should "be empty" taggedAs(SlowTest) ignore { ... }
                                                           ^

This class is used via an implicit conversion (named convertToInAndIgnoreMethodsAfterTaggedAs) from ResultOfTaggedAsInvocation. The ResultOfTaggedAsInvocation class does not declare any methods named in, because the type passed to in differs in a AnyFlatSpec and a FixtureAnyFlatSpec. A FixtureAnyFlatSpec needs two in methods, one that takes a no-arg test function and another that takes a one-arg test function (a test that takes a Fixture as its parameter). By constrast, a AnyFlatSpec needs only one in method that takes a by-name parameter. As a result, AnyFlatSpec and FixtureAnyFlatSpec each provide an implicit conversion from ResultOfTaggedAsInvocation to a type that provides the appropriate in methods.

Class that supports test registration via the ItWord instance referenced from AnyFlatSpec's it field.

This class enables syntax such as the following test registration:

it should "pop values in last-in-first-out order" in { ... }
                                                 ^

It also enables syntax such as the following registration of an ignored test:

it should "pop values in last-in-first-out order" ignore { ... }
                                                 ^

In addition, it enables syntax such as the following registration of a pending test:

it should "pop values in last-in-first-out order" is (pending)
                                                 ^

And finally, it also enables syntax such as the following tagged test registration:

it should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                 ^

For more information and examples of the use of the it field, see the main documentation for trait AnyFlatSpec.

Class that supports the registration of tagged tests via the ItWord instance referenced from AnyFlatSpec's it field.

This class enables syntax such as the following tagged test registration:

it should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                                    ^

It also enables syntax such as the following registration of an ignored, tagged test:

it should "pop values in last-in-first-out order" taggedAs(SlowTest) ignore { ... }
                                                                    ^

In addition, it enables syntax such as the following registration of a pending, tagged test:

it should "pop values in last-in-first-out order" taggedAs(SlowTest) is (pending)
                                                                    ^

For more information and examples of the use of the it field to register tagged tests, see the Tagging tests section in the main documentation for trait AnyFlatSpec. For examples of tagged test registration, see the Tagging tests section in the main documentation for trait AnyFlatSpec.

Class that supports test (and shared test) registration via the instance referenced from AnyFlatSpec's it field.

This class enables syntax such as the following test registration:

it should "pop values in last-in-first-out order" in { ... }
^

It also enables syntax such as the following shared test registration:

it should behave like nonEmptyStack(lastItemPushed)
^

For more information and examples of the use of the it field, see the main documentation for this trait.

A PropertyCheckConfigParam that specifies how many generated values may be discarded, as a multiple of the successful attempts, before the property check is considered to be org.scalatest.prop.PropertyCheckResult.Exhausted.

In GeneratorDrivenPropertyChecks, a property evaluation is discarded if it throws DiscardedEvaluationException, which is produced by a whenever clause that evaluates to false. For example, consider this ScalaTest property check:

// forAll defined in GeneratorDrivenPropertyChecks
forAll { (n: Int) =>
 whenever (n > 0) {
   doubleIt(n) should equal (n * 2)
 }
}

In the above code, whenever a non-positive n is passed, the property function will complete abruptly with DiscardedEvaluationException.

Similarly, in Checkers, a property evaluation is discarded if the expression to the left of ScalaCheck's ==> operator is false. Here's an example:

// forAll defined in Checkers
forAll { (n: Int) =>
 (n > 0) ==> doubleIt(n) == (n * 2)
}

For either kind of property check, MaxDiscardedFactor indicates the maximum fraction of total tests that may be discarded, relative to the number of successful tests. For example, if this is set to 4.0, and you are running 100 tests, it may discard up to 400 tries before considering the test to be org.scalatest.prop.PropertyCheckResult.Exhausted.

A PropertyCheckConfigParam that specifies the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

A PropertyCheckConfigParam that specifies the minimum number of successful property evaluations required for the property to pass.

Once this many evaluations have passed, the property will return PropertyCheckResult.Success.

A test function taking no arguments and returning an Outcome.

For more detail and examples, see the relevant section in the documentation for trait fixture.FlatSpec.

Abstract class defining a family of configuration parameters for property checks.

The subclasses of this abstract class are used to pass configuration information to the forAll methods of traits PropertyChecks (for ScalaTest-style property checks) and Checkers(for ScalaCheck-style property checks).

Internal utility functions for configuration management.

Describes the configuration to use when evaluating a property.

A PropertyCheckConfigParam that (with minSize) specifies the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

Note that the size range is added to minSize in order to calculate the maximum size passed to ScalaCheck. Using a range allows compile-time checking of a non-negative number being specified.

This class supports the syntax of FlatSpec, WordSpec, fixture.FlatSpec, and fixture.WordSpec.

This class is used in conjunction with an implicit conversion to enable can methods to be invoked on Strings.

This class supports the syntax of FlatSpec, WordSpec, fixture.FlatSpec, and fixture.WordSpec.

This class is used in conjunction with an implicit conversion to enable must methods to be invoked on Strings.

This class supports the syntax of FlatSpec, WordSpec, fixture.FlatSpec, and fixture.WordSpec.

This class is used in conjunction with an implicit conversion to enable should methods to be invoked on Strings.

Class that supports test registration via the TheyWord instance referenced from AnyFlatSpec's they field.

This class enables syntax such as the following test registration:

they should "pop values in last-in-first-out order" in { ... }
                                                   ^

It also enables syntax such as the following registration of an ignored test:

they should "pop values in last-in-first-out order" ignore { ... }
                                                   ^

In addition, it enables syntax such as the following registration of a pending test:

they should "pop values in last-in-first-out order" is (pending)
                                                   ^

And finally, it also enables syntax such as the following tagged test registration:

they should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                   ^

For more information and examples of the use of the it field, see the main documentation for trait AnyFlatSpec.

Class that supports the registration of tagged tests via the TheyWord instance referenced from AnyFlatSpec's they field.

This class enables syntax such as the following tagged test registration:

they should "pop values in last-in-first-out order" taggedAs(SlowTest) in { ... }
                                                                      ^

It also enables syntax such as the following registration of an ignored, tagged test:

they should "pop values in last-in-first-out order" taggedAs(SlowTest) ignore { ... }
                                                                      ^

In addition, it enables syntax such as the following registration of a pending, tagged test:

they should "pop values in last-in-first-out order" taggedAs(SlowTest) is (pending)
                                                                      ^

For more information and examples of the use of the they field to register tagged tests, see the Tagging tests section in the main documentation for trait AnyFlatSpec. For examples of tagged test registration, see the Tagging tests section in the main documentation for trait AnyFlatSpec.

Class that supports test (and shared test) registration via the instance referenced from AnyFlatSpec's it field.

This class enables syntax such as the following test registration:

they should "pop values in last-in-first-out order" in { ... }
^

It also enables syntax such as the following shared test registration:

they should behave like nonEmptyStack(lastItemPushed)
^

For more information and examples of the use of the it field, see the main documentation for this trait.

A PropertyCheckConfigParam that specifies the number of worker threads to use when evaluating a property.

Property evaluation runs on a single thread by default, but may run multiple threads if desired. If so, the evaluation will generally run faster. However, be careful not to use this if there is any risk of deadlocks, race conditions, or other hazards of multi-threaded code in evaluating this property or the code under test.

Returns a TripleEqualsInvocationOnSpread[T], given an Spread[T], to facilitate the “<left> should !== (<pivot> +- <tolerance>)” syntax of Matchers.

Returns a TripleEqualsInvocation[Null], given a null reference, to facilitate the “<left> should !== null” syntax of Matchers.

Returns a TripleEqualsInvocation[T], given an object of type T, to facilitate the “<left> should !== <right>” syntax of Matchers.

Returns a TripleEqualsInvocationOnSpread[T], given an Spread[T], to facilitate the “<left> should === (<pivot> +- <tolerance>)” syntax of Matchers.

Returns a TripleEqualsInvocation[Null], given a null reference, to facilitate the “<left> should === null” syntax of Matchers.

Returns a TripleEqualsInvocation[T], given an object of type T, to facilitate the “<left> should === <right>” syntax of Matchers.

Returns an Alerter that during test execution will forward strings passed to its apply method to the current reporter. If invoked in a constructor, it will register the passed string for forwarding later during test execution. If invoked while this AnyFlatSpec is being executed, such as from inside a test function, it will forward the information to the current reporter immediately. If invoked at any other time, it will print to the standard output. This method can be called safely by any thread.

Assert that a boolean condition, described in String message, is true. If the condition is true, this method returns normally. Else, it throws TestFailedException with a helpful error message appended with the String obtained by invoking toString on the specified clue as the exception's detail message.

This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:

• assert(a == b, "a good clue")

• assert(a != b, "a good clue")

• assert(a === b, "a good clue")

• assert(a !== b, "a good clue")

• assert(a > b, "a good clue")

• assert(a >= b, "a good clue")

• assert(a < b, "a good clue")

• assert(a <= b, "a good clue")

• assert(a startsWith "prefix", "a good clue")

• assert(a endsWith "postfix", "a good clue")

• assert(a contains "something", "a good clue")

• assert(a eq b, "a good clue")

• assert(a ne b, "a good clue")

• assert(a > 0 && b > 5, "a good clue")

• assert(a > 0 || b > 5, "a good clue")

• assert(a.isEmpty, "a good clue")

• assert(!a.isEmpty, "a good clue")

• assert(a.isInstanceOf[String], "a good clue")

• assert(a.length == 8, "a good clue")

• assert(a.size == 8, "a good clue")

• assert(a.exists(_ == 8), "a good clue")

At this time, any other form of expression will just get a TestFailedException with message saying the given expression was false. In the future, we will enhance this macro to give helpful error messages in more situations. In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean to be the default in tests. This makes === consistent between tests and production code.

Assert that a boolean condition is true. If the condition is true, this method returns normally. Else, it throws TestFailedException.

This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:

• assert(a == b)

• assert(a != b)

• assert(a === b)

• assert(a !== b)

• assert(a > b)

• assert(a >= b)

• assert(a < b)

• assert(a <= b)

• assert(a startsWith "prefix")

• assert(a endsWith "postfix")

• assert(a contains "something")

• assert(a eq b)

• assert(a ne b)

• assert(a > 0 && b > 5)

• assert(a > 0 || b > 5)

• assert(a.isEmpty)

• assert(!a.isEmpty)

• assert(a.isInstanceOf[String])

• assert(a.length == 8)

• assert(a.size == 8)

• assert(a.exists(_ == 8))

At this time, any other form of expression will get a TestFailedException with message saying the given expression was false. In the future, we will enhance this macro to give helpful error messages in more situations. In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean to be the default in tests. This makes === consistent between tests and production code.

Asserts that a given string snippet of code passes both the Scala parser and type checker.

You can use this to make sure a snippet of code compiles:

assertCompiles("val a: Int = 1")

Although assertCompiles is implemented with a macro that determines at compile time whether the snippet of code represented by the passed string compiles, errors (i.e., snippets of code that do not compile) are reported as test failures at runtime.

Asserts that a given string snippet of code does not pass either the Scala parser or type checker.

Often when creating libraries you may wish to ensure that certain arrangements of code that represent potential “user errors” do not compile, so that your library is more error resistant. ScalaTest's Assertions trait includes the following syntax for that purpose:

assertDoesNotCompile("val a: String = \"a string")

Although assertDoesNotCompile is implemented with a macro that determines at compile time whether the snippet of code represented by the passed string doesn't compile, errors (i.e., snippets of code that do compile) are reported as test failures at runtime.

Note that the difference between assertTypeError and assertDoesNotCompile is that assertDoesNotCompile will succeed if the given code does not compile for any reason, whereas assertTypeError will only succeed if the given code does not compile because of a type error. If the given code does not compile because of a syntax error, for example, assertDoesNotCompile will return normally but assertTypeError will throw a TestFailedException.

Assert that the value passed as expected equals the value passed as actual. If the actual value equals the expected value (as determined by ==), assertResult returns normally. Else, assertResult throws a TestFailedException whose detail message includes the expected and actual values.

Assert that the value passed as expected equals the value passed as actual. If the actual equals the expected (as determined by ==), assertResult returns normally. Else, if actual is not equal to expected, assertResult throws a TestFailedException whose detail message includes the expected and actual values, as well as the String obtained by invoking toString on the passed clue.

Ensure that an expected exception is thrown by the passed function value. The thrown exception must be an instance of the type specified by the type parameter of this method. This method invokes the passed function. If the function throws an exception that's an instance of the specified type, this method returns Succeeded. Else, whether the passed function returns normally or completes abruptly with a different exception, this method throws TestFailedException.

Note that the type specified as this method's type parameter may represent any subtype of AnyRef, not just Throwable or one of its subclasses. In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. If a class instance is passed for a type that could not possibly be used to catch an exception (such as String, for example), this method will complete abruptly with a TestFailedException.

Also note that the difference between this method and intercept is that this method does not return the expected exception, so it does not let you perform further assertions on that exception. Instead, this method returns Succeeded, which means it can serve as the last statement in an async- or safe-style suite. It also indicates to the reader of the code that nothing further is expected about the thrown exception other than its type. The recommended usage is to use assertThrows by default, intercept only when you need to inspect the caught exception further.

Asserts that a given string snippet of code does not pass the Scala type checker, failing if the given snippet does not pass the Scala parser.

Often when creating libraries you may wish to ensure that certain arrangements of code that represent potential “user errors” do not compile, so that your library is more error resistant. ScalaTest's Assertions trait includes the following syntax for that purpose:

assertTypeError("val a: String = 1")

Although assertTypeError is implemented with a macro that determines at compile time whether the snippet of code represented by the passed string type checks, errors (i.e., snippets of code that do type check) are reported as test failures at runtime.

Note that the difference between assertTypeError and assertDoesNotCompile is that assertDoesNotCompile will succeed if the given code does not compile for any reason, whereas assertTypeError will only succeed if the given code does not compile because of a type error. If the given code does not compile because of a syntax error, for example, assertDoesNotCompile will return normally but assertTypeError will throw a TestFailedException.

Assume that a boolean condition, described in String message, is true. If the condition is true, this method returns normally. Else, it throws TestCanceledException with a helpful error message appended with String obtained by invoking toString on the specified clue as the exception's detail message.

This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:

• assume(a == b, "a good clue")

• assume(a != b, "a good clue")

• assume(a === b, "a good clue")

• assume(a !== b, "a good clue")

• assume(a > b, "a good clue")

• assume(a >= b, "a good clue")

• assume(a < b, "a good clue")

• assume(a <= b, "a good clue")

• assume(a startsWith "prefix", "a good clue")

• assume(a endsWith "postfix", "a good clue")

• assume(a contains "something", "a good clue")

• assume(a eq b, "a good clue")

• assume(a ne b, "a good clue")

• assume(a > 0 && b > 5, "a good clue")

• assume(a > 0 || b > 5, "a good clue")

• assume(a.isEmpty, "a good clue")

• assume(!a.isEmpty, "a good clue")

• assume(a.isInstanceOf[String], "a good clue")

• assume(a.length == 8, "a good clue")

• assume(a.size == 8, "a good clue")

• assume(a.exists(_ == 8), "a good clue")

At this time, any other form of expression will just get a TestCanceledException with message saying the given expression was false. In the future, we will enhance this macro to give helpful error messages in more situations. In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean to be the default in tests. This makes === consistent between tests and production code.

Assume that a boolean condition is true. If the condition is true, this method returns normally. Else, it throws TestCanceledException.

This method is implemented in terms of a Scala macro that will generate a more helpful error message for expressions of this form:

• assume(a == b)

• assume(a != b)

• assume(a === b)

• assume(a !== b)

• assume(a > b)

• assume(a >= b)

• assume(a < b)

• assume(a <= b)

• assume(a startsWith "prefix")

• assume(a endsWith "postfix")

• assume(a contains "something")

• assume(a eq b)

• assume(a ne b)

• assume(a > 0 && b > 5)

• assume(a > 0 || b > 5)

• assume(a.isEmpty)

• assume(!a.isEmpty)

• assume(a.isInstanceOf[String])

• assume(a.length == 8)

• assume(a.size == 8)

• assume(a.exists(_ == 8))

At this time, any other form of expression will just get a TestCanceledException with message saying the given expression was false. In the future, we will enhance this macro to give helpful error messages in more situations. In ScalaTest 2.0, however, this behavior was sufficient to allow the === that returns Boolean to be the default in tests. This makes === consistent between tests and production code.

Throws TestCanceledException, with the passed Throwable cause, to indicate a test failed. The getMessage method of the thrown TestCanceledException will return cause.toString.

Throws TestCanceledException, with the passed String message as the exception's detail message and Throwable cause, to indicate a test failed.

Throws TestCanceledException, with the passed String message as the exception's detail message, to indicate a test was canceled.

Throws TestCanceledException to indicate a test was canceled.

Returns an Equality[A] for any type A that determines equality by first calling .deep on any Array (on either the left or right side), then comparing the resulting objects with ==.

Executes one or more tests in this Suite, printing results to the standard output.

This method invokes run on itself, passing in values that can be configured via the parameters to this method, all of which have default values. This behavior is convenient when working with ScalaTest in the Scala interpreter. Here's a summary of this method's parameters and how you can use them:

The testName parameter

If you leave testName at its default value (of null), this method will pass None to the testName parameter of run, and as a result all the tests in this suite will be executed. If you specify a testName, this method will pass Some(testName) to run, and only that test will be run. Thus to run all tests in a suite from the Scala interpreter, you can write:

scala> (new ExampleSuite).execute()

(The above syntax actually invokes the overloaded parameterless form of execute, which calls this form with its default parameter values.) To run just the test named "my favorite test" in a suite from the Scala interpreter, you would write:

scala> (new ExampleSuite).execute("my favorite test")

Or:

scala> (new ExampleSuite).execute(testName = "my favorite test")

The configMap parameter

If you provide a value for the configMap parameter, this method will pass it to run. If not, the default value of an empty Map will be passed. For more information on how to use a config map to configure your test suites, see the config map section in the main documentation for this trait. Here's an example in which you configure a run with the name of an input file:

scala> (new ExampleSuite).execute(configMap = Map("inputFileName" -> "in.txt")

The color parameter

If you leave the color parameter unspecified, this method will configure the reporter it passes to run to print to the standard output in color (via ansi escape characters). If you don't want color output, specify false for color, like this:

scala> (new ExampleSuite).execute(color = false)

The durations parameter

If you leave the durations parameter unspecified, this method will configure the reporter it passes to run to not print durations for tests and suites to the standard output. If you want durations printed, specify true for durations, like this:

scala> (new ExampleSuite).execute(durations = true)

The shortstacks and fullstacks parameters

If you leave both the shortstacks and fullstacks parameters unspecified, this method will configure the reporter it passes to run to not print stack traces for failed tests if it has a stack depth that identifies the offending line of test code. If you prefer a short stack trace (10 to 15 stack frames) to be printed with any test failure, specify true for shortstacks:

scala> (new ExampleSuite).execute(shortstacks = true)

For full stack traces, set fullstacks to true:

scala> (new ExampleSuite).execute(fullstacks = true)

If you specify true for both shortstacks and fullstacks, you'll get full stack traces.

The stats parameter

If you leave the stats parameter unspecified, this method will not fire RunStarting and either RunCompleted or RunAborted events to the reporter it passes to run. If you specify true for stats, this method will fire the run events to the reporter, and the reporter will print the expected test count before the run, and various statistics after, including the number of suites completed and number of tests that succeeded, failed, were ignored or marked pending. Here's how you get the stats:

scala> (new ExampleSuite).execute(stats = true)

To summarize, this method will pass to run:

• testName - None if this method's testName parameter is left at its default value of null, else Some(testName).

• reporter - a reporter that prints to the standard output

• stopper - a Stopper whose apply method always returns false

• filter - a Filter constructed with None for tagsToInclude and Set() for tagsToExclude

• configMap - the configMap passed to this method

• distributor - None

• tracker - a new Tracker

Note: In ScalaTest, the terms "execute" and "run" basically mean the same thing and can be used interchangably. The reason this method isn't named run is that it takes advantage of default arguments, and you can't mix overloaded methods and default arguments in Scala. (If named run, this method would have the same name but different arguments than the main run method that takes seven arguments. Thus it would overload and couldn't be used with default argument values.)

Design note: This method has two "features" that may seem unidiomatic. First, the default value of testName is null. Normally in Scala the type of testName would be Option[String] and the default value would be None, as it is in this trait's run method. The null value is used here for two reasons. First, in ScalaTest 1.5, execute was changed from four overloaded methods to one method with default values, taking advantage of the default and named parameters feature introduced in Scala 2.8. To not break existing source code, testName needed to have type String, as it did in two of the overloaded execute methods prior to 1.5. The other reason is that execute has always been designed to be called primarily from an interpeter environment, such as the Scala REPL (Read-Evaluate-Print-Loop). In an interpreter environment, minimizing keystrokes is king. A String type with a null default value lets users type suite.execute("my test name") rather than suite.execute(Some("my test name")), saving several keystrokes.

The second non-idiomatic feature is that shortstacks and fullstacks are all lower case rather than camel case. This is done to be consistent with the Shell, which also uses those forms. The reason lower case is used in the Shell is to save keystrokes in an interpreter environment. Most Unix commands, for example, are all lower case, making them easier and quicker to type. In the ScalaTest Shell, methods like shortstacks, fullstacks, and nostats, etc., are designed to be all lower case so they feel more like shell commands than methods.

The total number of tests that are expected to run when this Suite's run method is invoked.

This trait's implementation of this method returns the sum of:

• the size of the testNames List, minus the number of tests marked as ignored and any tests that are exluded by the passed Filter

• the sum of the values obtained by invoking expectedTestCount on every nested Suite contained in nestedSuites

Throws TestFailedException, with the passed Throwable cause, to indicate a test failed. The getMessage method of the thrown TestFailedException will return cause.toString.

Throws TestFailedException, with the passed String message as the exception's detail message and Throwable cause, to indicate a test failed.

Throws TestFailedException, with the passed String message as the exception's detail message, to indicate a test failed.

Throws TestFailedException to indicate a test failed.

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d"), (famousLastWords, "e"), (famousLastWords, "f")) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a", "b", "c", "d", "e", "f") { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d"), (famousLastWords, "e")) { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a", "b", "c", "d", "e") { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c"), (famousLastWords, "d")) { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords, famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a", "b", "c", "d") { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a"), (famousLastWords, "b"), (famousLastWords, "c")) { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords, famousLastWords, famousLastWords) { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a", "b", "c") { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a"), (famousLastWords, "b")) { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords, famousLastWords) { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a", "b") { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

Performs a property check by applying the specified property check function to named arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll ((famousLastWords, "a")) { (a: String) =>
 a.length should equal ((a).length)
}

Performs a property check by applying the specified property check function to arguments supplied by the specified generators.

Here's an example:

import org.scalacheck.Gen

// Define your own string generator:
val famousLastWords = for {
 s <- Gen.oneOf("the", "program", "compiles", "therefore", "it", "should", "work")
} yield s

forAll (famousLastWords) { (a: String) =>
 a.length should equal ((a).length)
}

Performs a property check by applying the specified property check function with the specified argument names to arguments supplied by implicitly passed generators.

Here's an example:

forAll ("a") { (a: String) =>
 a.length should equal ((a).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators.

Here's an example:

forAll { (a: String) =>
 a.length should equal ((a).length)
}

Performs a property check by applying the specified property check function to arguments supplied by implicitly passed generators, modifying the values in the implicitly passed PropertyGenConfig object with explicitly passed parameter values.

This method creates a ConfiguredPropertyCheck object that has six overloaded apply methods that take a function. Thus it is used with functions of all six arities. Here are some examples:

forAll (minSize(1), sizeRange(9)) { (a: String) =>
 a.length should equal ((a).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String) =>
 a.length + b.length should equal ((a + b).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String) =>
 a.length + b.length + c.length should equal ((a + b + c).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String) =>
 a.length + b.length + c.length + d.length should equal ((a + b + c + d).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String, e: String) =>
 a.length + b.length + c.length + d.length + e.length should equal ((a + b + c + d + e).length)
}

forAll (minSize(1), sizeRange(9)) { (a: String, b: String, c: String, d: String, e: String, f: String) =>
 a.length + b.length + c.length + d.length + e.length + f.length should equal ((a + b + c + d + e + f).length)
}

Given some optional PropertyCheckConfigParams and a PropertyCheckConfiguration, compute the resulting Configuration.Parameter.

This function deals with resolving the various forms of these configuration values, into a consistent form suitable for using in properties.

Duplicate PropertyCheckConfigParam entries are not permitted in the configParams list.

TODO: should this function be public? It feels like an internal implementation detail -- I think it should be private.

Returns an Informer that during test execution will forward strings passed to its apply method to the current reporter. If invoked in a constructor, it will register the passed string for forwarding later during test execution. If invoked from inside a scope, it will forward the information to the current reporter immediately. If invoked from inside a test function, it will record the information and forward it to the current reporter only after the test completed, as recordedEvents of the test completed event, such as TestSucceeded. If invoked at any other time, it will print to the standard output. This method can be called safely by any thread.

Intercept and return an exception that's expected to be thrown by the passed function value. The thrown exception must be an instance of the type specified by the type parameter of this method. This method invokes the passed function. If the function throws an exception that's an instance of the specified type, this method returns that exception. Else, whether the passed function returns normally or completes abruptly with a different exception, this method throws TestFailedException.

Note that the type specified as this method's type parameter may represent any subtype of AnyRef, not just Throwable or one of its subclasses. In Scala, exceptions can be caught based on traits they implement, so it may at times make sense to specify a trait that the intercepted exception's class must mix in. If a class instance is passed for a type that could not possibly be used to catch an exception (such as String, for example), this method will complete abruptly with a TestFailedException.

Also note that the difference between this method and assertThrows is that this method returns the expected exception, so it lets you perform further assertions on that exception. By contrast, the assertThrows method returns Succeeded, which means it can serve as the last statement in an async- or safe-style suite. assertThrows also indicates to the reader of the code that nothing further is expected about the thrown exception other than its type. The recommended usage is to use assertThrows by default, intercept only when you need to inspect the caught exception further.

Returns a Documenter that during test execution will forward strings passed to its apply method to the current reporter. If invoked in a constructor, it will register the passed string for forwarding later during test execution. If invoked from inside a scope, it will forward the information to the current reporter immediately. If invoked from inside a test function, it will record the information and forward it to the current reporter only after the test completed, as recordedEvents of the test completed event, such as TestSucceeded. If invoked at any other time, it will print to the standard output. This method can be called safely by any thread.

Returns a MaxDiscardedFactor property check configuration parameter containing the passed value, which specifies the factor of discarded property evaluations allowed during property evaluation.

Returns a MinSize property check configuration parameter containing the passed value, which specifies the minimum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

Returns a MinSuccessful property check configuration parameter containing the passed value, which specifies the minimum number of successful property evaluations required for the property to pass.

An immutable IndexedSeq of this Suite object's nested Suites. If this Suite contains no nested Suites, this method returns an empty IndexedSeq. This trait's implementation of this method returns an empty List.

Returns a Notifier that during test execution will forward strings passed to its apply method to the current reporter. If invoked in a constructor, it will register the passed string for forwarding later during test execution. If invoked while this AnyFlatSpec is being executed, such as from inside a test function, it will forward the information to the current reporter immediately. If invoked at any other time, it will print to the standard output. This method can be called safely by any thread.

Throws TestPendingException to indicate a test is pending.

A pending test is one that has been given a name but is not yet implemented. The purpose of pending tests is to facilitate a style of testing in which documentation of behavior is sketched out before tests are written to verify that behavior (and often, the before the behavior of the system being tested is itself implemented). Such sketches form a kind of specification of what tests and functionality to implement later.

To support this style of testing, a test can be given a name that specifies one bit of behavior required by the system being tested. The test can also include some code that sends more information about the behavior to the reporter when the tests run. At the end of the test, it can call method pending, which will cause it to complete abruptly with TestPendingException. Because tests in ScalaTest can be designated as pending with TestPendingException, both the test name and any information sent to the reporter when running the test can appear in the report of a test run. (In other words, the code of a pending test is executed just like any other test.) However, because the test completes abruptly with TestPendingException, the test will be reported as pending, to indicate the actual test, and possibly the functionality it is intended to test, has not yet been implemented.

Note: This method always completes abruptly with a TestPendingException. Thus it always has a side effect. Methods with side effects are usually invoked with parentheses, as in pending(). This method is defined as a parameterless method, in flagrant contradiction to recommended Scala style, because it forms a kind of DSL for pending tests. It enables tests in suites such as FunSuite or FunSpec to be denoted by placing "(pending)" after the test name, as in:

test("that style rules are not laws") (pending)

Readers of the code see "pending" in parentheses, which looks like a little note attached to the test name to indicate it is pending. Whereas "(pending()) looks more like a method call, "(pending)" lets readers stay at a higher level, forgetting how it is implemented and just focusing on the intent of the programmer who wrote the code.

Execute the passed block of code, and if it completes abruptly, throw TestPendingException, else throw TestFailedException.

This method can be used to temporarily change a failing test into a pending test in such a way that it will automatically turn back into a failing test once the problem originally causing the test to fail has been fixed. At that point, you need only remove the pendingUntilFixed call. In other words, a pendingUntilFixed surrounding a block of code that isn't broken is treated as a test failure. The motivation for this behavior is to encourage people to remove pendingUntilFixed calls when there are no longer needed.

This method facilitates a style of testing in which tests are written before the code they test. Sometimes you may encounter a test failure that requires more functionality than you want to tackle without writing more tests. In this case you can mark the bit of test code causing the failure with pendingUntilFixed. You can then write more tests and functionality that eventually will get your production code to a point where the original test won't fail anymore. At this point the code block marked with pendingUntilFixed will no longer throw an exception (because the problem has been fixed). This will in turn cause pendingUntilFixed to throw TestFailedException with a detail message explaining you need to go back and remove the pendingUntilFixed call as the problem orginally causing your test code to fail has been fixed.

The fully qualified class name of the rerunner to rerun this suite. This implementation will look at this.getClass and see if it is either an accessible Suite, or it has a WrapWith annotation. If so, it returns the fully qualified class name wrapped in a Some, or else it returns None.

Run a test. This trait's implementation runs the test registered with the name specified by testName. Each test's name is a concatenation of the text of all describers surrounding a test, from outside in, and the test's spec text, with one space placed between each item. (See the documenation for testNames for an example.)

Run zero to many of this AnyFlatSpec's tests.

This method takes a testName parameter that optionally specifies a test to invoke. If testName is Some, this trait's implementation of this method invokes runTest on this object, passing in:

• testName - the String value of the testName Option passed to this method

• reporter - the Reporter passed to this method, or one that wraps and delegates to it

• stopper - the Stopper passed to this method, or one that wraps and delegates to it

• configMap - the configMap passed to this method, or one that wraps and delegates to it

This method takes a Set of tag names that should be included (tagsToInclude), and a Set that should be excluded (tagsToExclude), when deciding which of this Suite's tests to execute. If tagsToInclude is empty, all tests will be executed except those those belonging to tags listed in the tagsToExclude Set. If tagsToInclude is non-empty, only tests belonging to tags mentioned in tagsToInclude, and not mentioned in tagsToExclude will be executed. However, if testName is Some, tagsToInclude and tagsToExclude are essentially ignored. Only if testName is None will tagsToInclude and tagsToExclude be consulted to determine which of the tests named in the testNames Set should be run. For more information on trait tags, see the main documentation for this trait.

If testName is None, this trait's implementation of this method invokes testNames on this Suite to get a Set of names of tests to potentially execute. (A testNames value of None essentially acts as a wildcard that means all tests in this Suite that are selected by tagsToInclude and tagsToExclude should be executed.) For each test in the testName Set, in the order they appear in the iterator obtained by invoking the elements method on the Set, this trait's implementation of this method checks whether the test should be run based on the tagsToInclude and tagsToExclude Sets. If so, this implementation invokes runTest, passing in:

• testName - the String name of the test to run (which will be one of the names in the testNames Set)

• reporter - the Reporter passed to this method, or one that wraps and delegates to it

• stopper - the Stopper passed to this method, or one that wraps and delegates to it

• configMap - the configMap passed to this method, or one that wraps and delegates to it

Returns a SizeRange property check configuration parameter containing the passed value, that (with minSize) specifies the maximum size parameter to provide to ScalaCheck, which it will use when generating objects for which size matters (such as strings or lists).

Note that the size range is added to minSize in order to calculate the maximum size passed to ScalaCheck. Using a range allows compile-time checking of a non-negative number being specified.

A string ID for this Suite that is intended to be unique among all suites reported during a run.

This trait's implementation of this method returns the fully qualified name of this object's class. Each suite reported during a run will commonly be an instance of a different Suite class, and in such cases, this default implementation of this method will suffice. However, in special cases you may need to override this method to ensure it is unique for each reported suite. For example, if you write a Suite subclass that reads in a file whose name is passed to its constructor and dynamically creates a suite of tests based on the information in that file, you will likely need to override this method in your Suite subclass, perhaps by appending the pathname of the file to the fully qualified class name. That way if you run a suite of tests based on a directory full of these files, you'll have unique suite IDs for each reported suite.

The suite ID is intended to be unique, because ScalaTest does not enforce that it is unique. If it is not unique, then you may not be able to uniquely identify a particular test of a particular suite. This ability is used, for example, to dynamically tag tests as having failed in the previous run when rerunning only failed tests.

A user-friendly suite name for this Suite.

This trait's implementation of this method returns the simple name of this object's class. This trait's implementation of runNestedSuites calls this method to obtain a name for Reports to pass to the suiteStarting, suiteCompleted, and suiteAborted methods of the Reporter.

A Map whose keys are String names of tagged tests and whose associated values are the Set of tags for the test. If this AnyFlatSpec contains no tags, this method returns an empty Map.

This trait's implementation returns tags that were passed as strings contained in Tag objects passed to taggedAs.

In addition, this trait's implementation will also auto-tag tests with class level annotations. For example, if you annotate @Ignore at the class level, all test methods in the class will be auto-annotated with org.scalatest.Ignore.

An immutable Set of test names. If this AnyFlatSpec contains no tests, this method returns an empty Set.

This trait's implementation of this method will return a set that contains the names of all registered tests. The set's iterator will return those names in the order in which the tests were registered. Each test's name is composed of the concatenation of the text of each surrounding describer, in order from outside in, and the text of the example itself, with all components separated by a space. For example, consider this AnyFlatSpec:

import org.scalatest.flatspec.AnyFlatSpec

class StackSpec extends AnyFlatSpec {

 "A Stack (when not empty)" must "allow me to pop" in {}
 it must "not be empty" in {}

 "A Stack (when not full)" must "allow me to push" in {}
 it must "not be full" in {}
}

Invoking testNames on this AnyFlatSpec will yield a set that contains the following two test name strings:

"A Stack (when not empty) must allow me to pop"
"A Stack (when not empty) must not be empty"
"A Stack (when not full) must allow me to push"
"A Stack (when not full) must not be full"

Returns a user friendly string for this suite, composed of the simple name of the class (possibly simplified further by removing dollar signs if added by the Scala interpeter) and, if this suite contains nested suites, the result of invoking toString on each of the nested suites, separated by commas and surrounded by parentheses.

Evaluates the passed code block if the passed boolean condition is true, else throws DiscardedEvaluationException.

The whenever method can be used inside property check functions to discard invocations of the function with data for which it is known the property would fail. For example, given the following Fraction class:

class Fraction(n: Int, d: Int) {

 require(d != 0)
 require(d != Integer.MIN_VALUE)
 require(n != Integer.MIN_VALUE)

 val numer = if (d < 0) -1 * n else n
 val denom = d.abs

 override def toString = numer + " / " + denom
}

import org.scalatest.prop.TableDrivenPropertyChecks._

val fractions =
 Table(
   ("n", "d"),
   (  1,   2),
   ( -1,   2),
   (  1,  -2),
   ( -1,  -2),
   (  3,   1),
   ( -3,   1),
   ( -3,   0),
   (  3,  -1),
   (  3,  Integer.MIN_VALUE),
   (Integer.MIN_VALUE, 3),
   ( -3,  -1)
 )

Imagine you wanted to check a property against this class with data that includes some value that are rejected by the constructor, such as a denominator of zero, which should result in an IllegalArgumentException. You could use whenever to discard any rows in the fraction that represent illegal arguments, like this:

import org.scalatest.matchers.Matchers._

forAll (fractions) { (n: Int, d: Int) =>

 whenever (d != 0 && d != Integer.MIN_VALUE
     && n != Integer.MIN_VALUE) {

   val f = new Fraction(n, d)

   if (n < 0 && d < 0 || n > 0 && d > 0)
     f.numer should be > 0
   else if (n != 0)
     f.numer should be < 0
   else
     f.numer should === (0)

   f.denom should be > 0
 }
}

In this example, rows 6, 8, and 9 have values that would cause a false to be passed to whenever. (For example, in row 6, d is 0, which means d != 0 will be false.) For those rows, whenever will throw DiscardedEvaluationException, which will cause the forAll method to discard that row.

Executes the block of code passed as the second parameter, and, if it completes abruptly with a ModifiableMessage exception, prepends the "clue" string passed as the first parameter to the beginning of the detail message of that thrown exception, then rethrows it. If clue does not end in a white space character, one space will be added between it and the existing detail message (unless the detail message is not defined).

This method allows you to add more information about what went wrong that will be reported when a test fails. Here's an example:

withClue("(Employee's name was: " + employee.name + ")") {
 intercept[IllegalArgumentException] {
   employee.getTask(-1)
 }
}

If an invocation of intercept completed abruptly with an exception, the resulting message would be something like:

(Employee's name was Bob Jones) Expected IllegalArgumentException to be thrown, but no exception was thrown

Run the passed test function in the context of a fixture established by this method.

This method should set up the fixture needed by the tests of the current suite, invoke the test function, and if needed, perform any clean up needed after the test completes. Because the NoArgTest function passed to this method takes no parameters, preparing the fixture will require side effects, such as reassigning instance vars in this Suite or initializing a globally accessible external database. If you want to avoid reassigning instance vars you can use FixtureSuite.

This trait's implementation of runTest invokes this method for each test, passing in a NoArgTest whose apply method will execute the code of the test.

This trait's implementation of this method simply invokes the passed NoArgTest function.

Returns a Workers property check configuration parameter containing the passed value, which specifies the number of worker threads to use when evaluating a property.

Trap and return any thrown exception that would normally cause a ScalaTest test to fail, or create and return a new RuntimeException indicating no exception is thrown.

This method is intended to be used in the Scala interpreter to eliminate large stack traces when trying out ScalaTest assertions and matcher expressions. It is not intended to be used in regular test code. If you want to ensure that a bit of code throws an expected exception, use intercept, not trap. Here's an example interpreter session without trap:

scala> import org.scalatest._
import org.scalatest._

scala> import Matchers._
import Matchers._

scala> val x = 12
a: Int = 12

scala> x shouldEqual 13
org.scalatest.exceptions.TestFailedException: 12 did not equal 13
  at org.scalatest.Assertions$class.newAssertionFailedException(Assertions.scala:449)
  at org.scalatest.Assertions$.newAssertionFailedException(Assertions.scala:1203)
  at org.scalatest.Assertions$AssertionsHelper.macroAssertTrue(Assertions.scala:417)
  at .<init>(<console>:15)
  at .<clinit>(<console>)
  at .<init>(<console>:7)
  at .<clinit>(<console>)
  at $print(<console>)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:731)
  at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:980)
  at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:570)
  at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:601)
  at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:565)
  at scala.tools.nsc.interpreter.ILoop.reallyInterpret$1(ILoop.scala:745)
  at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:790)
  at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:702)
  at scala.tools.nsc.interpreter.ILoop.processLine$1(ILoop.scala:566)
  at scala.tools.nsc.interpreter.ILoop.innerLoop$1(ILoop.scala:573)
  at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:576)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:867)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:822)
  at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:822)
  at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
  at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:822)
  at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:83)
  at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:96)
  at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:105)
  at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

That's a pretty tall stack trace. Here's what it looks like when you use trap:

scala> trap { x shouldEqual 13 }
res1: Throwable = org.scalatest.exceptions.TestFailedException: 12 did not equal 13

Much less clutter. Bear in mind, however, that if no exception is thrown by the passed block of code, the trap method will create a new NormalResult (a subclass of Throwable made for this purpose only) and return that. If the result was the Unit value, it will simply say that no exception was thrown:

scala> trap { x shouldEqual 12 }
res2: Throwable = No exception was thrown.

If the passed block of code results in a value other than Unit, the NormalResult's toString will print the value:

scala> trap { "Dude!" }
res3: Throwable = No exception was thrown. Instead, result was: "Dude!"

Although you can access the result value from the NormalResult, its type is Any and therefore not very convenient to use. It is not intended that trap be used in test code. The sole intended use case for trap is decluttering Scala interpreter sessions by eliminating stack traces when executing assertion and matcher expressions.

Supports shared test registration in AnyFlatSpecs.

This field supports syntax such as the following:

it should behave like nonFullStack(stackWithOneItem)
         ^

For more information and examples of the use of behave, see the Shared tests section in the main documentation for this trait.

Supports the registration of a “subject” being specified and tested.

This field enables syntax such as the following subject registration:

behavior of "A Stack"
^

For more information and examples of the use of the behavior field, see the main documentation for this trait.

Supports registration of ignored tests in AnyFlatSpecs.

This field enables syntax such as the following registration of an ignored test:

ignore should "pop values in last-in-first-out order" in { ... }
^

For more information and examples of the use of the ignore field, see the Ignored tests section in the main documentation for this trait.

Supports test (and shared test) registration in AnyFlatSpecs.

This field enables syntax such as the following test registration:

it should "pop values in last-in-first-out order" in { ... }
^

It also enables syntax such as the following shared test registration:

it should behave like nonEmptyStack(lastItemPushed)
^

For more information and examples of the use of the it field, see the main documentation for this trait.

The Succeeded singleton.

You can use succeed to solve a type error when an async test does not end in either Future[Assertion] or Assertion. Because Assertion is a type alias for Succeeded.type, putting succeed at the end of a test body (or at the end of a function being used to map the final future of a test body) will solve the type error.

Supports test (and shared test) registration in AnyFlatSpecs.

This field enables syntax such as the following test registration:

they should "pop values in last-in-first-out order" in { ... }
^

It also enables syntax such as the following shared test registration:

they should behave like nonEmptyStack(lastItemPushed)
^

For more information and examples of the use of the it field, see the main documentation for this trait.

The styleName lifecycle method has been deprecated and will be removed in a future version of ScalaTest.

This method was used to support the chosen styles feature, which was deactivated in 3.1.0. The internal modularization of ScalaTest in 3.2.0 will replace chosen styles as the tool to encourage consistency across a project. We do not plan a replacement for styleName.