gistfile1.txt

class Foo {
  @AutoFactory
  Foo(@Provider bar, String aString) {...}
}

@Generated(...AutoFactoryProcessor.class)
final class FooFactory {
  ...
  public Foo create(String s) { ... }
}

class MyService {
    @Inject MyService(FooFactory factoryOfFoos) { ... }
    @Inject ActionLogger log;

    Whoop extractWhoop() {
      Foo = factoryOfFoos().create(getSomeBlahString());
      ... // do stuff with Foo to get a Whoop for 10 lines or so
      Whoop result = ... // the final Whoop creation.
      return result;
    }
}

class MyServiceTest {
  @Test testDoStuffLogsProperly() {
    Foo testFoo = new Foo(new Bar(blah), "this is a test.");
    FooFactory factory = mock(FooFactory);
    when(factory.create(any(String.class))).return(testFoo); // faked for the test
    
    Whoop expectedWhoop = new Whoop(... whatever);

    ASSERT.that(objectUnderTest.extractWhoop()).isEqualTo(expectedWhoop);
    ASSERT.that(objectUnderTest.extractWhoop().whatever()).contains("this is a test.");
  }
}