// Different input should have different hashCode
        assertNotSame(item1.hashCode(), item4.hashCode());
    }

    @Test
    public void test_hashCode_withNullInput() {
        // Test hashCode with null input - should not throw, returns consistent hash for null
        StopwordsItem item1 = new StopwordsItem(1, null);
        StopwordsItem item2 = new StopwordsItem(2, null);

        assertNotSame(item1.hashCode(), item3.hashCode());

        // Consistent hashCode
        assertEquals(item1.hashCode(), item1.hashCode());
    }

    @Test
    public void test_hashCode_withNullInput() {
        // Test hashCode with null input - should not throw, returns consistent hash for null
        ProtwordsItem item1 = new ProtwordsItem(1, null);
        ProtwordsItem item2 = new ProtwordsItem(2, null);

Shinsuke Sugaya <******@****.***> 1773442886 +0900