} catch (InvalidQueryException e) {
            assertTrue(e.getMessage().contains("Unknown q:"));
        }
    }

    @Test
    public void test_convertPhraseQuery_emptyTerms() {
        // Test with empty phrase query - should throw InvalidQueryException
        PhraseQuery.Builder builder = new PhraseQuery.Builder();
        PhraseQuery phraseQuery = builder.build();
        QueryContext context = new QueryContext("test", false);

   * Double#NEGATIVE_INFINITY}, or {@link Double#NaN}) then the result is {@link Double#NaN}.
   *
   * @throws IllegalStateException if the dataset is empty
   */
  public double populationCovariance() {
    checkState(count() != 0);
    return sumOfProductsOfDeltas / count();
  }

  /**

    for (Character c : map.keySet()) {
      replacements[c] = map.get(c).toCharArray();
    }
    return replacements;
  }

  // Immutable empty array for when there are no replacements.
  @SuppressWarnings("ConstantCaseForConstants") // An empty array is a constant.
  private static final char[][] EMPTY_REPLACEMENT_ARRAY = new char[0][0];

    extends ForwardingMap<Class<? extends @NonNull B>, B>
    implements ClassToInstanceMap<B>, Serializable {

  private static final ImmutableClassToInstanceMap<Object> EMPTY =
      new ImmutableClassToInstanceMap<>(ImmutableMap.of());

  /**
   * Returns an empty {@code ImmutableClassToInstanceMap}.
   *
   * <p><b>Performance note:</b> the instance returned is a singleton.
   *
   * @since 19.0
   */

    getMultiset().entrySet().clear();
    assertTrue("multiset not empty after entrySet().clear()", getMultiset().isEmpty());
  }

  @CollectionSize.Require(ONE)
  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
  public void testEntrySet_iteratorRemovePropagates() {
    Iterator<Multiset.Entry<E>> iterator = getMultiset().entrySet().iterator();
    assertTrue(

        byte[] out = ctx.initSecContext(null, 0, 0);

        // Assert: returns a SPNEGO token (opaque here but non-null/non-empty)
        assertNotNull(out);
        assertTrue(out.length > 0);

        // Verify interactions: flags and an empty optimistic token are used
        verify(this.mechContext, times(1)).getFlags();
        ArgumentCaptor<byte[]> cap = ArgumentCaptor.forClass(byte[].class);

        @Test
        @DisplayName("getName can return null and empty strings via mock")
        void mock_nameEdgeValues() {
            // Arrange
            when(mockEntry.getName()).thenReturn(null, "", " ");

            // Act & Assert
            assertNull(mockEntry.getName(), "first call returns null");
            assertEquals("", mockEntry.getName(), "second call returns empty");

        assertEquals("", myConfig.prefix());
        assertEquals("myConfig", myConfig.name());
        String config = node.toString();
        assertFalse(config.isEmpty(), "Expected collection to not be empty but was empty");
    }

    String toXml(Model model) throws IOException, XMLStreamException {
        StringWriter sw = new StringWriter();
        MavenStaxWriter writer = new MavenStaxWriter();

                               aria-controls="listSearchForm"><i class="fas fa-search" aria-hidden="true"></i></a>
                            <div class="collapse <c:if test="${!empty name || !empty urls || !empty description}">show</c:if>" id="listSearchForm">
                                <la:form action="/admin/webconfig/">
                                    <div class="form-group row">

            assertEquals(expectedServer, result.getServer());
            // The implementation returns empty strings as empty strings, not null
            assertEquals(expectedShare.isEmpty() ? "" : expectedShare, result.getShare());
            assertEquals(expectedPath.isEmpty() ? "" : expectedPath, result.getPath());
        }