String text = "";
        String field = "content";

        List<String> results = converter.convert(text, field, "en");

        assertNotNull(results);
        assertTrue(results.isEmpty() || (results.size() == 1 && results.get(0).isEmpty()));
    }

    @Test
    public void testConvertWithNullText() throws IOException {
        // Test convert with null text - this might throw exception
        String text = null;

  }

  /**
   * Returns {@code true} if {@code rowKeyList().size == 0} or {@code columnKeyList().size() == 0}.
   */
  @Override
  public boolean isEmpty() {
    return rowList.isEmpty() || columnList.isEmpty();
  }

  /**
   * {@inheritDoc}
   *
   * @throws IllegalArgumentException if {@code rowKey} is not in {@link #rowKeySet()} or {@code

  public @Nullable V get(@Nullable Object rowKey, @Nullable Object columnKey) {
    Map<C, V> row = safeGet(rowMap(), rowKey);
    return (row == null) ? null : safeGet(row, columnKey);
  }

  @Override
  public boolean isEmpty() {
    return size() == 0;
  }

  @Override
  public void clear() {
    Iterators.clear(cellSet().iterator());
  }

  @CanIgnoreReturnValue
  @Override

    assertEquals(0, service.startUpCalled);
    assertEquals(0, service.shutDownCalled);
    assertEquals(Service.State.TERMINATED, service.state());
    assertThat(service.transitionStates).isEmpty();
  }

  public void testStop_afterStart() {
    TestService service = new TestService();
    service.startAsync().awaitRunning();
    assertEquals(1, service.startUpCalled);

      assertWithMessage("%s to %s", from, from).that(from.to(from, "foo")).isSameInstanceAs("foo");
      for (CaseFormat to : CaseFormat.values()) {
        assertWithMessage("%s to %s", from, to).that(from.to(to, "")).isEmpty();
        assertWithMessage("%s to %s", from, to).that(from.to(to, " ")).isEqualTo(" ");
      }
    }
  }

  @J2ktIncompatible
  @GwtIncompatible // NullPointerTester
  public void testNullArguments() {

    assume().that(network.allowsSelfLoops()).isTrue();

    addNode(N1);
    addEdge(N1, N1, E11);
    assertThat(networkAsMutableNetwork.removeNode(N1)).isTrue();
    assertThat(network.nodes()).isEmpty();
    assertThat(network.edges()).doesNotContain(E11);
  }

  @Test
  public void removeEdge_existingSelfLoopEdge() {
    assume().that(graphIsMutable()).isTrue();

        queryContext = new QueryContext("test", false);
        queryContext.addSorts();

        assertFalse(queryContext.hasSorts());
        assertTrue(queryContext.sortBuilders().isEmpty());
    }

    // Test hasSorts
    @Test
    public void test_hasSorts() {
        queryContext = new QueryContext("test", false);
        assertFalse(queryContext.hasSorts());

        assertNull(message.getRole());
        assertNull(message.getContent());
        assertNotNull(message.getTimestamp());
        assertNotNull(message.getSources());
        assertTrue(message.getSources().isEmpty());
    }

    @Test
    public void test_constructorWithRoleAndContent() {
        final ChatMessage message = new ChatMessage("user", "Hello");
        assertNull(message.getId());

        assertNotNull(encData.getUserAuthorizations());
        // Assuming KerberosAuthData.parse is tested elsewhere and might return empty for this test case
        assertTrue(encData.getUserAuthorizations().isEmpty());
    }

    /**
     * Test constructor with a malformed token.
     */
    @Test
    void testConstructorMalformed() {
        byte[] malformedToken = new byte[] { 0x01, 0x02, 0x03, 0x04 };

  }

  /**
   * Returns {@code true} if {@code rowKeyList().size == 0} or {@code columnKeyList().size() == 0}.
   */
  @Override
  public boolean isEmpty() {
    return rowList.isEmpty() || columnList.isEmpty();
  }

  /**
   * {@inheritDoc}
   *
   * @throws IllegalArgumentException if {@code rowKey} is not in {@link #rowKeySet()} or {@code