Mockito for int primitive

Question

If I am using a Wrapper class type variable as argument Mockito test case is getting pass but, how to write Mockito test case for int primitive type variable which is an argumen

Answer 1

I know that the question has been more than 4 years and 8 months old but for the sake of clear solution as of today, I am posting this

In my case, the method signature to be tested is

public SomeObject create(String code, int status)

so the test code for verifying the argument values when the method was invoked would be following

verify(this.service).create(
        argThat(code -> "dummy_code".equals(code)),
        intThat(status -> status == 105));

If I go with the argThat even for int (or any primitive types) then mockito throws NPE

Currently I am using org.mockito:mockito-core:jar:2.15.0 which must have been advanced considering the time when the question was asked! But thinking that this might be helpful to people... Thanks,

Answer 2

You may have some trouble with any or argThat for primitive-type arguments to when and verify. Those Object-centric methods do their work with side-effects correctly, but they tend to return null for a dummy return value, which doesn't work for Java unwrapping primitives via auto-boxing.

Luckily, the org.mockito.ArgumentMatchers class has a full complement of primitive-centric methods (of which I've listed the int methods here):

static int anyInt()
static int eq(int value)
static int intThat(org.hamcrest.ArgumentMatcher<java.lang.Integer> matcher)

See all of them at the documentation for the ArgumentMatchers class.