void testNotEqualsNull() {
            assertFalse(testMessage.equals(null));
        }

        @Test
        @DisplayName("Should not be equal to different type")
        void testNotEqualsDifferentType() {
            assertFalse(testMessage.equals("not a message"));
        }

        @Test
        @DisplayName("Should be equal to itself")
        void testEqualsSelf() {