Programming language: Scala
License: MIT License
Tags: Testing     Mocking    
Latest version: v5.1.0

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Native Scala mocking.

Official website: scalamock.org


Expectations-First Style

test("drawline interaction with turtle") {
  // Create mock Turtle object
  val m = mock[Turtle]

  // Set expectations
  (m.setPosition _).expects(10.0, 10.0)
  (m.forward _).expects(5.0)
  (m.getPosition _).expects().returning(15.0, 10.0)

  // Exercise System Under Test
  drawLine(m, (10.0, 10.0), (15.0, 10.0))

Record-then-Verify (Mockito) Style

test("drawline interaction with turtle") {
  // Create stub Turtle
  val m = stub[Turtle]

  // Setup return values
  (m.getPosition _).when().returns(15.0, 10.0)

  // Exercise System Under Test
  drawLine(m, (10.0, 10.0), (15.0, 10.0))

  // Verify expectations met
  (m.setPosition _).verify(10.0, 10.0)
  (m.forward _).verify(5.0)

A more complete example is on our Quickstart page.


  • Fully typesafe
  • Full support for Scala features such as:
    • Polymorphic (type parameterised) methods
    • Operators (methods with symbolic names)
    • Overloaded methods
    • Type constraints
  • ScalaTest and Specs2 integration
  • Mock and Stub support
  • Macro Mocks and JVM Proxy Mocks
  • Scala.js support
  • built for Scala 2.11, 2.12, 2.13
  • Scala 2.10 support was included up to ScalaMock 4.2.0

Using ScalaMock

Artefacts are published to Maven Central and Sonatype OSS.

For ScalaTest, to use ScalaMock in your Tests, add the following to your build.sbt:

libraryDependencies += Seq("org.scalamock" %% "scalamock" % "5.2.0" % Test,
    "org.scalatest" %% "scalatest" % "3.2.0" % Test)


For usage in Maven or Gradle, integration with Specs2, and more example examples see the User Guide


YourKit is kindly supporting open source projects with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit's leading software products: YourKit Java Profiler and YourKit .NET Profiler.

Many thanks to Jetbrains for providing us with an OSS licence for their fine development tools such as IntelliJ IDEA.

Also, thanks to https://github.com/fthomas/scala-steward for helping to keep our dependencies updated automatically.