// Test distinct with empty array
        String[] input = new String[0];
        String[] result = invokeDistinct(input);
        assertSame(input, result);
    }

    public void test_distinct_singleElement() {
        // Test distinct with single element
        String[] input = new String[] { "element" };
        String[] result = invokeDistinct(input);
        assertSame(input, result);
    }