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trait MatcherProducers extends AnyRef

Provides an implicit conversion on functions that produce Matchers, i.e., T => Matcher[T] that enables you to modify error messages when composing Matchers.

For an example of using MatcherProducers, see the Composing matchers section in the main documentation for trait Matcher.

Source
MatcherProducers.scala
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Type Members

  1. class Composifier[T] extends AnyRef

    Class used via an implicit conversion that adds composeTwice, mapResult, and mapArgs methods to functions that produce a Matcher.

Value Members

  1. implicit def convertToComposifier[T](f: (T) => Matcher[T]): Composifier[T]

    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
    

    T

    the type used by function f

    f

    a function that takes a T and return a Matcher[T]

    returns

    an object that has composeTwice, mapResult and mapArgs methods.