void setUp() {
        // Reset mock before each test to ensure clean state
        // MockitoExtension handles this automatically for @Mock fields, but good to be aware.
    }

    @Test
    void testIsReceived() {
        // Test initial state (should be false by default for a fresh mock)
        assertFalse(mockResponse.isReceived());

        // Simulate received status

        assertEquals(nextResponse, second);
        assertEquals(thirdResponse, third);
        assertNull(end);
    }

    @Test
    @DisplayName("Test Response interface methods - isReceived")
    void testIsReceived() {
        // Given
        when(response.isReceived()).thenReturn(true);

        // When
        boolean received = response.isReceived();

        // Then
        assertTrue(received);