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

    public void test_distinct_noDuplicates() {
        // Test distinct with no duplicates
        String[] input = new String[] { "a", "b", "c" };
        String[] result = invokeDistinct(input);
        assertEquals(3, result.length);