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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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MatcherProducers
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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.

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

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    @throws( ... )
  6. 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.

  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
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  10. final def getClass(): Class[_]
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  11. def hashCode(): Int
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  12. final def isInstanceOf[T0]: Boolean
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  13. final def ne(arg0: AnyRef): Boolean
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  14. final def notify(): Unit
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  15. final def notifyAll(): Unit
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  16. final def synchronized[T0](arg0: ⇒ T0): T0
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  17. def toString(): String
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  18. final def wait(): Unit
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    @throws( ... )
  19. final def wait(arg0: Long, arg1: Int): Unit
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  20. final def wait(arg0: Long): Unit
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