PathAnyFunSpecLike
Implementation trait for class Path.FunSpec
, which is
a sister class to org.scalatest.funspec.AnyFunSpec
that isolates
tests by running each test in its own instance of the test class,
and for each test, only executing the path leading to that test.
PathAnyFunSpec
is a class, not a trait,
to minimize compile time given there is a slight compiler overhead to
mixing in traits compared to extending classes. If you need to mix the
behavior of PathAnyFunSpec
into some other class, you can use this
trait instead, because class PathAnyFunSpec
does nothing more than
extend this trait and add a nice toString
implementation.
See the documentation of the class for a detailed
overview of PathAnyFunSpec
.
Type members
Classlikes
Class that, via an instance referenced from the it
field,
supports test (and shared test) registration in PathAnyFunSpec
s.
Class that, via an instance referenced from the it
field,
supports test (and shared test) registration in PathAnyFunSpec
s.
This class supports syntax such as the following test registration:
it("should be empty") ^
and the following shared test registration:
it should behave like nonFullStack(stackWithOneItem) ^
For more information and examples, see the main documentation for PathAnyFunSpec
.
Class that, via an instance referenced from the they
field,
supports test (and shared test) registration in PathAnyFunSpec
s.
Class that, via an instance referenced from the they
field,
supports test (and shared test) registration in PathAnyFunSpec
s.
This class supports syntax such as the following test registration:
they("should be empty") ^
and the following shared test registration:
they should behave like nonFullStack(stackWithOneItem) ^
For more information and examples, see the main documentation for PathAnyFunSpec
.
Inherited classlikes
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:
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))
- Value parameters:
- leftSide
An object to convert to
Equalizer
, which represents the value on the left side of a===
or!==
invocation.
- Inherited from:
- TripleEqualsSupport
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:
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))
- Value parameters:
- leftSide
An object to convert to
Equalizer
, which represents the value on the left side of a===
or!==
invocation.
- Inherited from:
- TripleEqualsSupport
Value members
Concrete methods
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
PathAnyFunSpec
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.
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
PathAnyFunSpec
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.
Describe a “subject” being specified and tested by the passed function value. The
passed function value may contain more describers (defined with describe
) and/or tests
(defined with it
).
Describe a “subject” being specified and tested by the passed function value. The
passed function value may contain more describers (defined with describe
) and/or tests
(defined with it
).
This class's implementation of this method will decide whether to
register the description text and invoke the passed function
based on whether or not this is part of the current "test path." For the details on this process, see
the How it executes section of the main documentation for trait
org.scalatest.funspec.PathAnyFunSpec
.
The total number of tests that are expected to run when this PathAnyFunSpec
's run
method
is invoked.
The total number of tests that are expected to run when this PathAnyFunSpec
's run
method
is invoked.
This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.
This trait's implementation of this method returns the size of the testNames
List
, minus
the number of tests marked as ignored as well as any tests excluded by the passed Filter
.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Value parameters:
- filter
a
Filter
with which to filter tests to count based on their tags
- Definition Classes
- SuiteMixin -> Suite
Supports registration of a test to ignore.
Supports registration of a test to ignore.
For more information and examples of this method's use, see the
Ignored tests section in the main documentation for sister
trait org.scalatest.funspec.AnyFunSpec
. Note that a separate instance will be created for an ignored test,
and the path to the ignored test will be executed in that instance, but the test function itself will not
be executed. Instead, a TestIgnored
event will be fired.
- Value parameters:
- testFun
the test function
- testTags
the optional list of tags for this test
- testText
the specification text, which will be combined with the descText of any surrounding describers to form the test name
- Throws:
- DuplicateTestNameException
if a test with the same name has been registered previously
- NullArgumentException
if
specText
or any passed test tag isnull
- TestRegistrationClosedException
if invoked after
run
has been invoked on this suite
Returns an Informer
that during test execution will forward strings (and other objects) passed to its
apply
method to the current reporter. If invoked in a constructor (including within a test, since
those are invoked during construction in a PathAnyFunSpec
, it
will register the passed string for forwarding later when run
is invoked. 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 an Informer
that during test execution will forward strings (and other objects) passed to its
apply
method to the current reporter. If invoked in a constructor (including within a test, since
those are invoked during construction in a PathAnyFunSpec
, it
will register the passed string for forwarding later when run
is invoked. 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 Documenter
that during test execution will forward strings (and other objects) passed to its
apply
method to the current reporter. If invoked in a constructor (including within a test, since
those are invoked during construction in a PathAnyFunSpec
, it
will register the passed string for forwarding later when run
is invoked. 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 Documenter
that during test execution will forward strings (and other objects) passed to its
apply
method to the current reporter. If invoked in a constructor (including within a test, since
those are invoked during construction in a PathAnyFunSpec
, it
will register the passed string for forwarding later when run
is invoked. 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 an empty list.
Returns an empty list.
This lifecycle method is unused by this trait. If invoked, it will return an empty list, because
nested suites are not allowed in a PathAnyFunSpec
. Because
a PathAnyFunSpec
executes tests eagerly at construction time, registering the results of
those test runs and reporting them later, the order of nested suites versus test runs would be different
in a org.scalatest.funspec.PathAnyFunSpec
than in an org.scalatest.funspec.AnyFunSpec
. In an
org.scalatest.funspec.PathAnyFunSpec
, nested suites are executed then tests are executed. In an
org.scalatest.funspec.PathAnyFunSpec
it would be the opposite. To make the code easy to reason about,
therefore, this is just not allowed. If you want to add nested suites to a PathAnyFunSpec
, you can
instead wrap them all in a Suites
object and put them in whatever order you wish.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Definition Classes
- SuiteMixin -> Suite
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
PathAnyFunSpec
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.
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
PathAnyFunSpec
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.
Runs this PathAnyFunSpec
, reporting test results that were registered when the tests
were run, each during the construction of its own instance.
Runs this PathAnyFunSpec
, reporting test results that were registered when the tests
were run, each during the construction of its own instance.
This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.
If testName
is None
, this trait's implementation of this method
will report the registered results for all tests except any excluded by the passed Filter
.
If testName
is defined, it will report the results of only that named test. Because a
PathAnyFunSpec
is not allowed to contain nested suites, this trait's implementation of
this method does not call runNestedSuites
.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Value parameters:
- args
the
Args
for this run- testName
an optional name of one test to run. If
None
, all relevant tests should be run. I.e.,None
acts like a wildcard that means run all relevant tests in thisSuite
.
- Throws:
- IllegalArgumentException
if
testName
is defined, but no test with the specified test name exists in thisSuite
- NullArgumentException
if any passed parameter is
null
.
- Definition Classes
- SuiteMixin -> Suite
This lifecycle method is unused by this trait, and is implemented to do nothing. If invoked, it will just return immediately.
This lifecycle method is unused by this trait, and is implemented to do nothing. If invoked, it will just return immediately.
Nested suites are not allowed in a PathAnyFunSpec
. Because
a PathAnyFunSpec
executes tests eagerly at construction time, registering the results of
those test runs and reporting them later, the order of nested suites versus test runs would be different
in a org.scalatest.funspec.PathAnyFunSpec
than in an org.scalatest.funspec.PathAnyFunSpec
. In an
org.scalatest.funspec.AnyFunSpec
, nested suites are executed then tests are executed. In an
org.scalatest.funspec.PathAnyFunSpec
it would be the opposite. To make the code easy to reason about,
therefore, this is just not allowed. If you want to add nested suites to a PathAnyFunSpec
, you can
instead wrap them all in a Suites
object and put them in whatever order you wish.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Definition Classes
- SuiteMixin -> Suite
Runs a test.
Runs a test.
This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.
This trait's implementation reports the test results 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 documentation
for testNames
for an example.)
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Value parameters:
- configMap
a
Map
of properties that can be used by thisFreeSpec
's executing tests.- reporter
the
Reporter
to which results will be reported- stopper
the
Stopper
that will be consulted to determine whether to stop execution early.- testName
the name of one test to execute.
- Throws:
- NullArgumentException
if any of
testName
,reporter
,stopper
, orconfigMap
isnull
.
- Definition Classes
- OneInstancePerTest -> SuiteMixin -> Suite
This lifecycle method is unused by this trait, and will complete abruptly with
UnsupportedOperationException
if invoked.
This lifecycle method is unused by this trait, and will complete abruptly with
UnsupportedOperationException
if invoked.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Definition Classes
- OneInstancePerTest -> SuiteMixin -> Suite
A Map
whose keys are String
tag names to which tests in this path.FreeSpec
belong, and values the Set
of test names that belong to each tag. If this path.FreeSpec
contains no tags, this method returns an empty Map
.
A Map
whose keys are String
tag names to which tests in this path.FreeSpec
belong, and values the Set
of test names that belong to each tag. If this path.FreeSpec
contains no tags, this method returns an empty Map
.
This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.
This trait's implementation returns tags that were passed as strings contained in Tag
objects passed
to methods it
and ignore
.
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 @Ignore.
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Definition Classes
- SuiteMixin -> Suite
An immutable Set
of test names. If this PathAnyFunSpec
contains no tests, this method returns an
empty Set
.
An immutable Set
of test names. If this PathAnyFunSpec
contains no tests, this method returns an
empty Set
.
This trait's implementation of this method will first ensure that the results of all tests, each run its its own instance executing only the path to the test, are registered. For details on this process see the How it executes section in the main documentation for this trait.
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 PathAnyFunSpec
:
import org.scalatest.funspec class StackSpec extends funspec.PathAnyFunSpec { describe("A Stack") { describe("when not empty") { "must allow me to pop" in {} } describe("when not full") { "must allow me to push" in {} } } }
Invoking testNames
on this PathAnyFunSpec
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 full must allow me to push"
This trait's implementation of this method is marked as final. For insight onto why, see the Shared fixtures section in the main documentation for this trait.
- Definition Classes
- SuiteMixin -> Suite
Inherited methods
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should !== (<pivot> +- <tolerance>)
”
syntax of Matchers
.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should !== (<pivot> +- <tolerance>)
”
syntax of Matchers
.
- Value parameters:
- right
the
Spread[T]
against which to compare the left-hand value
- Returns:
a
TripleEqualsInvocationOnSpread
wrapping the passedSpread[T]
value, withexpectingEqual
set tofalse
.- Inherited from:
- TripleEqualsSupport
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should !== null
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should !== null
” syntax
of Matchers
.
- Value parameters:
- right
a null reference
- Returns:
a
TripleEqualsInvocation
wrapping the passednull
value, withexpectingEqual
set tofalse
.- Inherited from:
- TripleEqualsSupport
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should !== <right>
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should !== <right>
” syntax
of Matchers
.
- Value parameters:
- right
the right-hand side value for an equality assertion
- Returns:
a
TripleEqualsInvocation
wrapping the passed right value, withexpectingEqual
set tofalse
.- Inherited from:
- TripleEqualsSupport
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should === (<pivot> +- <tolerance>)
”
syntax of Matchers
.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should === (<pivot> +- <tolerance>)
”
syntax of Matchers
.
- Value parameters:
- right
the
Spread[T]
against which to compare the left-hand value
- Returns:
a
TripleEqualsInvocationOnSpread
wrapping the passedSpread[T]
value, withexpectingEqual
set totrue
.- Inherited from:
- TripleEqualsSupport
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should === null
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should === null
” syntax
of Matchers
.
- Value parameters:
- right
a null reference
- Returns:
a
TripleEqualsInvocation
wrapping the passednull
value, withexpectingEqual
set totrue
.- Inherited from:
- TripleEqualsSupport
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should === <right>
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should === <right>
” syntax
of Matchers
.
- Value parameters:
- right
the right-hand side value for an equality assertion
- Returns:
a
TripleEqualsInvocation
wrapping the passed right value, withexpectingEqual
set totrue
.- Inherited from:
- TripleEqualsSupport
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.
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.
- Value parameters:
- clue
An objects whose
toString
method returns a message to include in a failure report.- condition
the boolean condition to assert
- Throws:
- NullArgumentException
if
message
isnull
.- TestFailedException
if the condition is
false
.
- Inherited from:
- Assertions
Assert that a boolean condition is true.
If the condition is true
, this method returns normally.
Else, it throws TestFailedException
.
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.
- Value parameters:
- condition
the boolean condition to assert
- Throws:
- TestFailedException
if the condition is
false
.
- Inherited from:
- Assertions
Asserts that a given string snippet of code passes both the Scala parser and type checker.
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.
- Value parameters:
- code
the snippet of code that should compile
- Inherited from:
- Assertions
Asserts that a given string snippet of code does not pass either the Scala parser or type checker.
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
.
- Value parameters:
- code
the snippet of code that should not type check
- Inherited from:
- Assertions
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
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.
- Value parameters:
- actual
the actual value, which should equal the passed
expected
value- expected
the expected value
- Throws:
- TestFailedException
if the passed
actual
value does not equal the passedexpected
value.
- Inherited from:
- Assertions
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
.
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
.
- Value parameters:
- actual
the actual value, which should equal the passed
expected
value- clue
An object whose
toString
method returns a message to include in a failure report.- expected
the expected value
- Throws:
- TestFailedException
if the passed
actual
value does not equal the passedexpected
value.
- Inherited from:
- Assertions
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
.
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.
- Value parameters:
- classTag
an implicit
ClassTag
representing the type of the specified type parameter.- f
the function value that should throw the expected exception
- Returns:
the
Succeeded
singleton, if an exception of the expected type is thrown- Throws:
- TestFailedException
if the passed function does not complete abruptly with an exception that's an instance of the specified type.
- Inherited from:
- Assertions
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.
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
.
- Value parameters:
- code
the snippet of code that should not type check
- Inherited from:
- Assertions
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.
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.
- Value parameters:
- clue
An objects whose
toString
method returns a message to include in a failure report.- condition
the boolean condition to assume
- Throws:
- NullArgumentException
if
message
isnull
.- TestCanceledException
if the condition is
false
.
- Inherited from:
- Assertions
Assume that a boolean condition is true.
If the condition is true
, this method returns normally.
Else, it throws TestCanceledException
.
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.
- Value parameters:
- condition
the boolean condition to assume
- Throws:
- TestCanceledException
if the condition is
false
.
- Inherited from:
- Assertions
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
Throwable
cause, to indicate a test failed.
The getMessage
method of the thrown TestCanceledException
will return cause.toString
.
- Value parameters:
- cause
a
Throwable
that indicates the cause of the cancellation.
- Throws:
- NullArgumentException
if
cause
isnull
- Inherited from:
- Assertions
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 and Throwable
cause, to indicate a test failed.
- Value parameters:
- cause
A
Throwable
that indicates the cause of the failure.- message
A message describing the failure.
- Throws:
- NullArgumentException
if
message
orcause
isnull
- Inherited from:
- Assertions
Throws TestCanceledException
, with the passed
String
message
as the exception's detail
message, to indicate a test was canceled.
Throws TestCanceledException
, with the passed
String
message
as the exception's detail
message, to indicate a test was canceled.
- Value parameters:
- message
A message describing the cancellation.
- Throws:
- NullArgumentException
if
message
isnull
- Inherited from:
- Assertions
Throws TestCanceledException
to indicate a test was canceled.
Throws TestCanceledException
to indicate a test was canceled.
- Inherited from:
- Assertions
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
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 ==
.
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 ==
.
- Returns:
a default
Equality
for typeA
- Inherited from:
- TripleEqualsSupport
Executes one or more tests in this Suite
, printing results to the standard output.
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'stestName
parameter is left at its default value ofnull
, elseSome(testName)
. -
reporter
- a reporter that prints to the standard output -
stopper
- aStopper
whoseapply
method always returnsfalse
-
filter
- aFilter
constructed withNone
fortagsToInclude
andSet()
fortagsToExclude
-
configMap
- theconfigMap
passed to this method -
distributor
-None
-
tracker
- a newTracker
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.
- Value parameters:
- color
a boolean that configures whether output is printed in color
- configMap
a
Map
of key-value pairs that can be used by the executingSuite
of tests.- durations
a boolean that configures whether test and suite durations are printed to the standard output
- fullstacks
a boolean that configures whether full stack traces should be printed for test failures
- shortstacks
a boolean that configures whether short stack traces should be printed for test failures
- stats
a boolean that configures whether test and suite statistics are printed to the standard output
- testName
the name of one test to run.
- Throws:
- IllegalArgumentException
if
testName
is defined, but no test with the specified test name exists in thisSuite
- NullArgumentException
if the passed
configMap
parameter isnull
.
- Inherited from:
- Suite
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
Throwable
cause, to indicate a test failed.
The getMessage
method of the thrown TestFailedException
will return cause.toString
.
- Value parameters:
- cause
a
Throwable
that indicates the cause of the failure.
- Throws:
- NullArgumentException
if
cause
isnull
- Inherited from:
- Assertions
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 and Throwable
cause, to indicate a test failed.
- Value parameters:
- cause
A
Throwable
that indicates the cause of the failure.- message
A message describing the failure.
- Throws:
- NullArgumentException
if
message
orcause
isnull
- Inherited from:
- Assertions
Throws TestFailedException
, with the passed
String
message
as the exception's detail
message, to indicate a test failed.
Throws TestFailedException
, with the passed
String
message
as the exception's detail
message, to indicate a test failed.
- Value parameters:
- message
A message describing the failure.
- Throws:
- NullArgumentException
if
message
isnull
- Inherited from:
- Assertions
Throws TestFailedException
to indicate a test failed.
Throws TestFailedException
to indicate a test failed.
- Inherited from:
- Assertions
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
.
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.
- Value parameters:
- classTag
an implicit
ClassTag
representing the type of the specified type parameter.- f
the function value that should throw the expected exception
- Returns:
the intercepted exception, if it is of the expected type
- Throws:
- TestFailedException
if the passed function does not complete abruptly with an exception that's an instance of the specified type.
- Inherited from:
- Assertions
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
Throws TestPendingException
to indicate a test is pending.
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.
- Inherited from:
- Assertions
Execute the passed block of code, and if it completes abruptly, throw TestPendingException
, else
throw TestFailedException
.
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.
- Value parameters:
- f
a block of code, which if it completes abruptly, should trigger a
TestPendingException
- Throws:
- TestPendingException
if the passed block of code completes abruptly with an
Exception
orAssertionError
- Inherited from:
- Assertions
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.
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.
- Inherited from:
- Suite
A string ID for this Suite
that is intended to be unique among all suites reported during a run.
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.
- Returns:
this
Suite
object's ID.- Inherited from:
- Suite
A user-friendly suite name for this Suite
.
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 Report
s to pass to the suiteStarting
, suiteCompleted
,
and suiteAborted
methods of the Reporter
.
- Returns:
this
Suite
object's suite name.- Inherited from:
- Suite
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
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).
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
- Throws:
- NullArgumentException
if the passed
clue
isnull
- Inherited from:
- Assertions
Deprecated and Inherited methods
- Deprecated
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
- Deprecated
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
- Deprecated
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
- Deprecated
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals
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.
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.
- Deprecated
- Inherited from:
- Assertions
Concrete fields
Supports shared test registration in PathAnyFunSpec
s.
Supports shared test registration in PathAnyFunSpec
s.
This field supports syntax such as the following:
it should behave like nonFullStack(stackWithOneItem) ^
For more information and examples of the use of org.scalatest.funspec.AnyFunSpec
.
Supports test (and shared test) registration in PathAnyFunSpec
s.
Supports test (and shared test) registration in PathAnyFunSpec
s.
This field supports syntax such as the following:
it("should be empty") ^
class="stExamples" it should behave like nonFullStack(stackWithOneItem) ^
For more information and examples of the use of the it
field, see the main documentation for this trait.
Supports test (and shared test) registration in PathAnyFunSpec
s.
Supports test (and shared test) registration in PathAnyFunSpec
s.
This field supports syntax such as the following:
it("should be empty") ^
class="stExamples" it should behave like nonFullStack(stackWithOneItem) ^
For more information and examples of the use of the it
field, see the main documentation for this trait.
Deprecated fields
The styleName
lifecycle method has been deprecated and will be removed in a future version of ScalaTest.
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
.
- Deprecated
Inherited fields
The Succeeded
singleton.
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.
- Inherited from:
- Assertions
Extensions
Inherited extensions
Implicits
Inherited implicits
- Definition Classes
- TripleEquals -> TripleEqualsSupport
- Inherited from:
- TripleEquals