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How to check invokations with specific string labels in Specs2 with Mockito

I have a test on these lines:

httpClient.post(anyString, anyString) returns (first, second)

//do my thing

there were two(httpClient).post(anyString, anyString)

This works fine, but I want to verify that the first call passes a different body than the second call. The body is quite large, and I do not want to make an exact comparison using a rigorous example. I tried this:

there was one(httpClientMock).postMessage(anyString, argThat(contain("FOO"))
there was one(httpClientMock).postMessage(anyString, argThat(contain("FOO"))

This makes Mockito complain:

InvalidUseOfMatchersException: 
 [error] Invalid use of argument matchers!
 [error] 2 matchers expected, 3 recorded:

I also tried:

  there was one(httpClientMock).postMessage(argThat(contain("foo")), argThat(contain("FOO")))
  there was one(httpClientMock).postMessage(argThat(contain("foo")), argThat(contain("FOO")))

that leads to:

Wanted 1 time:
 [error] -> ...
 [error] But was 2 times. Undesired invocation: ...

It seems to me that something like this should be possible, but I cannot figure it out. Insights?

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1 answer

I think this is more of a problem with Mockito for starters. When you use Mockito with specs2 and you doubt it always pops up in the direct Mockito API:

// simplified httpClient with only one parameter
val httpClient = mock[HttpClient]
httpClient.post(anyString) returns ""

httpClient.post("s1")
httpClient.post("s2")

// forget specs2
// there was two(httpClient).post(anyString)

org.mockito.Mockito.verify(httpClient, org.mockito.Mockito.times(1)).post("s1")

// I guess that you don't want this to pass but it does
org.mockito.Mockito.verify(httpClient, org.mockito.Mockito.times(1)).post("s1")

, , :

there was two(httpClient).post(consecutiveValues(===("s1"), ===("s2")))

consecutiveValues :

import matcher._
import MatcherImplicits._

// return a matcher that will check a value against a different
// `expected` matcher each time it is invoked
def consecutiveValues[T](expected: Matcher[T]*): Matcher[T] = {
  // count the number of tested values
  var i = -1

  // store the results
  var results: Seq[(Int, MatchResult[T])] = Seq()

  def result(t: T) = {
    i += 1
    // with Mockito values are tested twice
    // the first time we return the result (but also store it)
    // the second time we return the computed result
    if (i < expected.size) {
      val mr = expected(i).apply(Expectable(t))
      results = results :+ (i, mr)
      mr
     } else results(i - expected.size)._2
  }

  // return a function that is translated to a specs2 matcher
  // thanks to implicits
  // display the failing messages if there are any
  (t: T) => (result(t).isSuccess,
             results.filterNot(_._2.isSuccess).map { case (n, mr) => 
               s"value $n is incorrect: ${mr.message}" }.mkString(", "))
}

. , . :

httpClient.post("s1") 
httpClient.post("s2")

there was two(httpClient).post(consecutiveValues(===("s1"), ===("s3")))

:

[error] x test
[error]  The mock was not called as expected: 
[error]  httpClient.post(
[error]      value 1 is incorrect: 's2' is not equal to 's3'
[error]  );
[error]  Wanted 2 times:
[error]  -> at ... 
[error]  But was 1 time:
[error]  -> at ...
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