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.