Can Mockito verify an argument has certain properties/fields?

Question

Say I am mocking this class Foo

class Foo {
  public void doThing(Bar bar) {
    // ...
  }
}

and this is Bar

class Bar {
  private int i;
  public int getI() { return i; }
  public void setI(int i) { this.i = i; }
}

I know I can use Mockito's verify functionality to see if Foo#doThing(Bar) was called on the mock with a specific instance of Bar or any Bar with Mockito.any(Bar.class), but is there some way to ensure it was called by any Bar but with a specific value for i or Bar#getI()?

What I know is possible:

Foo mockedFoo = mock(Foo.class);
Bar someBar = mock(Bar.class);
...
verify(mockedFoo).doThing(someBar);
verify(mockedFoo).doThing(any(Bar.class);

What I want to know is if there is a way to verify that a Bar with particular things true about it was passed as an argument.

Answer 1

In Mockito 2.1.0 and up with Java 8 you can pass the lambda to argThat out of the box so that one does not need a custom argument matchers. For the example in the OP would be:

verify(mockedFoo).doThing(argThat((Bar aBar) -> aBar.getI() == 5));

This is because as of Mockito 2.1.0, ArgumentMatcher is a functional interface.