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scalamockingmockitojmockit
Arpit Agarwal
Arpit Agarwal

Reputation: 667

How to Mock a class in Scala

I am using Scala 2.11. can I use Scala test or Mockito to mock Scala Classes? All the examples that I see on StackOverflow and other blogs are mocking scala Traits rather than classes. Also I tried to use JMockit and it does not seem to work with Scala.

Upvotes: 1

Views: 3042

Answers (1)

Gabriele Petronella
Gabriele Petronella

Reputation: 108169

Using scalatest and the provided MockitoSugar module, you can do something like this (take from the official scalatest user guide)

// First, create the mock object
val mockCollaborator = mock[Collaborator]
// Create the class under test and pass the mock to it
classUnderTest = new ClassUnderTest
classUnderTest.addListener(mockCollaborator)

// Use the class under test
classUnderTest.addDocument("Document", new Array[Byte](0))
classUnderTest.addDocument("Document", new Array[Byte](0))
classUnderTest.addDocument("Document", new Array[Byte](0))
classUnderTest.addDocument("Document", new Array[Byte](0))

// Then verify the class under test used the mock object as expected
verify(mockCollaborator).documentAdded("Document")
verify(mockCollaborator, times(3)).documentChanged("Document")

Upvotes: 2

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