org.scalatest.matchers.MatcherProducers
See theMatcherProducers companion trait
Companion object that facilitates the importing of MatcherProducers members as an alternative to mixing it in. One use case is to import MatcherProducers's members so you can use MatcherProducers in the Scala interpreter.
Attributes
Companion
trait
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Supertypes
class Object
trait Matchable
class Any
Self type
Members list
Class used via an implicit conversion that adds composeTwice, mapResult, and mapArgs methods to functions that produce a Matcher.
Class used via an implicit conversion that adds composeTwice, mapResult, and mapArgs methods to functions that produce a Matcher.
Attributes
Inherited from:
MatcherProducers
Supertypes
class Object
trait Matchable
class Any
Implicit conversion that converts a function of T => Matcher[T] to an object that has composeTwice, mapResult and mapArgs methods.
Implicit conversion that converts a function of T => Matcher[T] to an object that has composeTwice, mapResult and mapArgs methods.
The following shows how this trait is used to compose twice and modify error messages:
import org.scalatest._
import matchers._
import MatcherProducers._
val f = be > (_: Int)
val g = (_: String).toInt
// f composeTwice g means: (f compose g) andThen (_ compose g)
val beAsIntsGreaterThan =
f composeTwice g mapResult { mr =>
mr.copy(
failureMessageArgs =
mr.failureMessageArgs.map((LazyArg(_) { "\"" + _.toString + "\".toInt"})),
negatedFailureMessageArgs =
mr.negatedFailureMessageArgs.map((LazyArg(_) { "\"" + _.toString + "\".toInt"})),
midSentenceFailureMessageArgs =
mr.midSentenceFailureMessageArgs.map((LazyArg(_) { "\"" + _.toString + "\".toInt"})),
midSentenceNegatedFailureMessageArgs =
mr.midSentenceNegatedFailureMessageArgs.map((LazyArg(_) { "\"" + _.toString + "\".toInt"}))
)
}
"7" should beAsIntsGreaterThan ("8")
The last assertion will fail with message like this:
"7".toInt was not greater than "8".toInt
Type parameters
T
the type used by function f
Value parameters
f
a function that takes a T and return a Matcher[T]
Attributes
Returns
an object that has composeTwice, mapResult and mapArgs methods.
Inherited from:
MatcherProducers