Native Scala mocking.
Official website: scalamock.org
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))
}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 2.12, 2.13, 3
- Scala 2.10 support was included up to ScalaMock 4.2.0
- Scala 2.11 support was included up to ScalaMock 5.2.0
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)- Type should be specified for methods with by-name parameters
trait TestTrait:
def byNameParam(x: => Int): String
val t = mock[TestTrait]
// this one no longer compiles
(t.byNameParam _).expects(*).returns("")
// this one should be used instead
(t.byNameParam(_: Int)).expects(*).returns("")- Not initialized vars are not supported anymore, use
scala.compiletime.uninitializedinstead - Vars are not mockable anymore
trait X:
var y: Int // No longer compiles
var y: Int = scala.compile.uninitialized // Should be used insteadMocking of non-abstract java classes is not available without workaround
public class JavaClass {
public int simpleMethod(String b) { return 4; }
}val m = mock[JavaClass] // No longer compiles
class JavaClassExtended extends JavaClass
val mm = mock[JavaClassExtended] // should be used insteadFor 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.