assertFalse(provider1.equals(null)); // Null check
        assertFalse(provider1.equals("string")); // Type check
    }

    // Test with rapid config changes
    @Test
    public void test_rapidConfigChanges() {
        for (int i = 0; i < 50; i++) {
            final int adjustment = i * 1000;
            FessConfig rapidConfig = new FessConfig.SimpleImpl() {