Two tricks of mockito

stub java static method and mock scala object

As I write scala, I will add mockito-core to build.sbt as well as mockito-scala.

"org.mockito" % "mockito-core" % "5.2.0" % "test",
"org.mockito" %% "mockito-scala" % "1.17.14" % "test"

stub java static method

We could use mockStatic method to mock java static method. But mockStatic has not been added to mockito-scala, so we should use it as plain as it’s in java. For example:

// TheStaticClass is a java class with a static method staticMethod
val mockedStatic = mockStatic(classOf[TheStaticClass])
// stub the static method and return the instance we want.
// It could be a mocked instance or a real instance.
mockedStatic.when(() => StaticClass.staticMethod()).thenReturn(mockedInstance)

mock scala object

You should enable withObjectMocked feature to use it. It is mandatory to create the file src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker
 containing a single line:

mock-maker-inline

withObjectMocked[TheObject] { // a scoped mock object
	// stub the object method here
	when(TheObject.f).thenReturn(sth)
}