// Test with null
        assertFalse(item1.equals(null));

        // Test with different class
        assertFalse(item1.equals("string"));
    }

    public void test_equals_withUnsortedInputs() {
        // Test that equals works correctly even when inputs are initially unsorted
        String[] inputs1 = { "z", "a", "m" };
        String[] inputs2 = { "m", "z", "a" };