Can view constrained Scala methods be mocked with Mockito and Specs2?

I ran into a problem with mocking methods that have view constraints on the type of their parameters using Mockito and Specs2. Simply put, because view binding translates to an additional implicit argument to a method, Mockito cannot match the call described by the wait to the actual arguments received by the mock:

For example:

//Receiver.scala
class Receiver {
  def methodWithViewBound[T <% WrappedString](w : T) : Unit = {
    //noop!
  }
}

//WrappedString.scala
class WrappedString(val wrapped : String) {

}

//TestMockedMethodWithViewBound.scala
import org.specs2.mutable._
import org.specs2.specification._
import org.specs2.mock._
import org.mockito.Matchers

class TestMockedMethodWithViewBound extends Specification with Mockito {

  implicit def wrapString(s : String) : WrappedString = new WrappedString(s);
  implicit def unwrapString(w : WrappedString) : String = w.wrapped;

  "Mockito" should {
    "Allow mocking of methods whose argument types include a view bound, using a matcher" in {
      val receiver = mock[Receiver]
      receiver.methodWithViewBound("Testing")
      there was one(receiver).methodWithViewBound(Matchers.eq("Testing")) 
    }


    "Allow mocking of methods whose argument types include a view bound, using an argument literal" in {
      val receiver = mock[Receiver]
      receiver.methodWithViewBound("Testing")
      there was one(receiver).methodWithViewBound("Testing")
    }
  }
}

      

        
        
        
      

    

The result of this gives:

[15:18:46] [tim@ahtanum ../tim/Projects/MockitoTest] $ sbt test
[info] Set current project to Mockito View Bounds Test (in build file:/home/tim/Projects/MockitoTest/)
[info] Compiling 1 Scala source to /home/tim/Projects/MockitoTest/target/scala-2.9.1/test-classes...
[info] Mockito should
[error] x Allow mocking of methods whose argument types include a view bound
[error]     The mock was not called as expected: 
[error] Invalid use of argument matchers!
[error] 2 matchers expected, 1 recorded.
[error] This exception may occur if matchers are combined with raw values:
[error]     //incorrect:
[error]     someMethod(anyObject(), "raw String");
[error] When using matchers, all arguments have to be provided by matchers.
[error] For example:
[error]     //correct:
[error]     someMethod(anyObject(), eq("String by matcher"));
[error] 
[error] For more info see javadoc for Matchers class. (TestMockedMethodWithViewBound.scala:12)
[info]  
[info]  
[info] Total for specification TestMockedMethodWithViewBound
[info] Finished in 175 ms
[info] 1 example, 1 failure, 0 error
[error] Failed: : Total 1, Failed 1, Errors 0, Passed 0, Skipped 0
[error] Failed tests:
[error]     TestMockedMethodWithViewBound
[error] {file:/home/tim/Projects/MockitoTest/}default-3adcf2/test:test: Tests unsuccessful
[error] Total time: 7 s, completed 07-Mar-2012 15:19:47
[15:19:47] [tim@ahtanum ../tim/Projects/MockitoTest] $ sbt test
[info] Set current project to Mockito View Bounds Test (in build file:/home/tim/Projects/MockitoTest/)
[info] Compiling 1 Scala source to /home/tim/Projects/MockitoTest/target/scala-2.9.1/test-classes...
[info] Mockito should
[error] x Allow mocking of methods whose argument types include a view bound, using a matcher
[error]     The mock was not called as expected: 
[error] Invalid use of argument matchers!
[error] 2 matchers expected, 1 recorded.
[error] This exception may occur if matchers are combined with raw values:
[error]     //incorrect:
[error]     someMethod(anyObject(), "raw String");
[error] When using matchers, all arguments have to be provided by matchers.
[error] For example:
[error]     //correct:
[error]     someMethod(anyObject(), eq("String by matcher"));
[error] 
[error] For more info see javadoc for Matchers class. (TestMockedMethodWithViewBound.scala:12)
[error] x Allow mocking of methods whose argument types include a view bound, using an argument literal
[error]     The mock was not called as expected: 
[error] Argument(s) are different! Wanted:
[error] receiver.methodWithViewBound(
[error]     "Testing",
[error]     ($anonfun$apply$mcV$sp$2) <function1>
[error] );
[error] -> at TestMockedMethodWithViewBound$$anonfun$1$$anonfun$apply$6$$anonfun$apply$2.apply$mcV$sp(TestMockedMethodWithViewBound.scala:22)
[error] Actual invocation has different arguments:
[error] receiver.methodWithViewBound(
[error]     "Testing",
[error]     ($anonfun$apply$7) <function1>
[error] );
[error] -> at TestMockedMethodWithViewBound$$anonfun$1$$anonfun$apply$6.apply(TestMockedMethodWithViewBound.scala:21)
[error]  (TestMockedMethodWithViewBound.scala:19)
[info]  
[info]  
[info] Total for specification TestMockedMethodWithViewBound
[info] Finished in 325 ms
[info] 2 examples (+1), 2 expectations (+1), 2 failures (+1), 0 error
[error] Failed: : Total 2, Failed 2, Errors 0, Passed 0, Skipped 0
[error] Failed tests:
[error]     TestMockedMethodWithViewBound
[error] {file:/home/tim/Projects/MockitoTest/}default-3adcf2/test:test: Tests unsuccessful
[error] Total time: 7 s, completed 07-Mar-2012 15:23:05

      

        
        
        
      

    

... has anyone encountered this issue before, or have any way of mocking methods with view constraints or implicit parameters using specs2?

Thank,

Tim