// Second mock implementation
            }
        };

        // Set first customizer
        pagerCreator.setPagerCustomizer(customizer1);
        assertSame(customizer1, pagerCreator.getPagerCustomizer());

        // Replace with second customizer
        pagerCreator.setPagerCustomizer(customizer2);
        assertSame(customizer2, pagerCreator.getPagerCustomizer());
    }

    // Test setting null customizer