Provides an implicit conversion on functions that produce Matcher
s, i.e.,
T => Matcher[T]
that enables you to modify error messages when composing Matcher
s.
For an example of using MatcherProducers
, see the Composing matchers
section in the main documentation for trait Matcher
.
- Companion:
- object
Type members
Classlikes
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
.
Implicits
Implicits
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 aMatcher[T]
- Returns:
an object that has
composeTwice
,mapResult
andmapArgs
methods.