void testReceivedState() {
            assertFalse(echoResponse.isReceived());

            echoResponse.received();

            assertTrue(echoResponse.isReceived());
        }

        @Test
        @DisplayName("Should track error state")
        void testErrorState() {
            assertFalse(echoResponse.isError());

            echoResponse.error();

    SingleCallListener singleCallListener = new SingleCallListener();
    singleCallListener.expectCall();

    assertFalse(spy.wasExecuted);
    assertFalse(singleCallListener.wasCalled());
    assertFalse(listenableFuture.isDone());

    listenableFuture.addListener(singleCallListener, executorService);
    abstractFuture.set(DATA1);

        assertEquals(url, exception.getUrl());
        assertEquals(message, exception.getMessage());
        assertEquals(cause, exception.getCause());
        assertFalse(exception.aborted());
    }

    @Test
    public void test_constructor_withUrlMessageExceptionAndAbortTrue() {
        // Test with URL, message, exception, and abort set to true

            }
        });
        final OsddHelper osddHelper = new OsddHelper();
        osddHelper.setContentType("application/opensearchdescription+xml");
        osddHelper.init();
        assertFalse(osddHelper.hasOpenSearchFile());

        try {
            osddHelper.asStream();
            fail();
        } catch (final Exception e) {

  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_supportedPresentKeyWrongValue() {
    assertFalse(getMap().remove(k0(), v3()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_REMOVE)
  public void testRemove_supportedWrongKeyPresentValue() {
    assertFalse(getMap().remove(k3(), v0()));
    expectUnchanged();
  }

  @MapFeature.Require(SUPPORTS_REMOVE)

        assertFalse(info.isReconnecting());
        assertNull(info.getFile());
    }

    @Test
    public void testHandleInfoExpiration() {
        // Test durable handle expiration
        HandleInfo durableInfo = new HandleInfo("/test/file.txt", testGuid, testFileId, HandleType.DURABLE_V2, 100, // 100ms timeout
                null);

        assertFalse(durableInfo.isExpired());

    try {
      assertFalse(entrySet.contains(nullKeyEntry));
    } catch (NullPointerException e) {
      assertFalse(allowsNullKeys);
    }
    Entry<@Nullable K, @Nullable V> nullKeyValueEntry = mapEntry(null, null);
    try {
      assertFalse(entrySet.contains(nullKeyValueEntry));
    } catch (NullPointerException e) {
      assertFalse(allowsNullKeys && allowsNullValues);
    }
  }

            }
        };

        HashMap<String, Object> source = new HashMap<>();
        assertFalse(fessConfig.validateIndexRequiredFields(source));
        source.put("aaa", null);
        assertFalse(fessConfig.validateIndexRequiredFields(source));
        source.put("aaa", null);
        source.put("bbb", null);
        assertFalse(fessConfig.validateIndexRequiredFields(source));
        source.put("aaa", "");

    void testIsSnapshot() {
        assertFalse(ArtifactUtils.isSnapshot(null));
        assertFalse(ArtifactUtils.isSnapshot(""));
        assertFalse(ArtifactUtils.isSnapshot("1.2.3"));
        assertTrue(ArtifactUtils.isSnapshot("1.2.3-SNAPSHOT"));
        assertTrue(ArtifactUtils.isSnapshot("1.2.3-snapshot"));
        assertTrue(ArtifactUtils.isSnapshot("1.2.3-20090413.094722-2"));

        // Test with different inputs
        assertFalse(item1.equals(item3));
        assertFalse(item3.equals(item1));

        // Test with different output
        assertFalse(item1.equals(item4));

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

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

    @Test