Class used via an implicit conversion that adds composeTwice, mapResult, and
mapArgs methods to functions that produce a Matcher.
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
the type used by function f
a function that takes a T and return a Matcher[T]
an object that has composeTwice, mapResult and mapArgs methods.
Provides an implicit conversion on functions that produce
Matchers, i.e.,T => Matcher[T]that enables you to modify error messages when composingMatchers.For an example of using
MatcherProducers, see the Composing matchers section in the main documentation for traitMatcher.