public void test_toString_withNullInValues() {
        // Test toString with null elements in values
        String name = "mixedParam";
        String[] values = { "value1", null, "value3" };
        RequestParameter param = new RequestParameter(name, values);

        String expected = "[mixedParam, [value1, null, value3]]";
        assertEquals(expected, param.toString());
    }

    @Test