public void testContains_nullNotContainedButAllowed() {
    assertFalse("containsValue(null) should return false", getMap().containsValue(null));
  }

  @MapFeature.Require(absent = ALLOWS_NULL_VALUE_QUERIES)
  public void testContains_nullNotContainedAndUnsupported() {
    expectNullValueMissingWhenNullValuesUnsupported(
        "containsValue(null) should return false or throw");
  }

  @MapFeature.Require(ALLOWS_NULL_VALUES)

     * @return The projects in the build order, never {@code null}.
     */
    List<MavenProject> getSortedProjects();

    /**
     * Gets the downstream projects of the specified project. A downstream project is a project that directly or
     * indirectly depends on the given project.
     *
     * @param project The project whose downstream projects should be retrieved, must not be {@code null}.

    }

    @Override
    public void alignToBaseDirectory(Model model, File basedir, ModelBuildingRequest request) {
        if (model == null || basedir == null) {
            return;
        }

        Build build = model.getBuild();

        if (build != null) {
            build.setDirectory(alignToBaseDirectory(build.getDirectory(), basedir));

        "A Map's hashCode() should be the sum of those of its entries (where "
            + "a null element in an entry counts as having a hash of zero).",
        expectedHashCode,
        getMap().hashCode());
  }

  private static int hash(Entry<?, ?> e) {
    return (e.getKey() == null ? 0 : e.getKey().hashCode())
        ^ (e.getValue() == null ? 0 : e.getValue().hashCode());
  }

        return profile.getActivation() != null && profile.getActivation().getFile() != null;
    }

    @Override
    public boolean isActive(Profile profile) {
        Activation activation = profile.getActivation();

        ActivationFile actFile = activation.getFile();

        if (actFile != null) {
            // check if the file exists, if it does then the profile will be active

        this.key = key;

        if (map == null) {
            map = new HashMap<>();
        }
        map.put(key, this);
    }

    public static ArtifactStatus valueOf(String status) {
        ArtifactStatus retVal = null;

        if (status != null) {
            retVal = map.get(status);
        }

        return retVal != null ? retVal : NONE;
    }

    @Override

        pageSize = getDefaultPageSize();
        currentPageNumber = getDefaultCurrentPageNumber();

        id = null;
        regularName = null;
        duplicateHostName = null;
        sortOrder = null;
        createdBy = null;
        createdTime = null;
        versionNo = null;

    }

    /**
     * Returns the default current page number.
     *

     *
     * @param path
     *            The path to the properties file. If {@code null}, a {@link FileAccessException} is thrown.
     * @throws FileAccessException
     *             If the file cannot be accessed or created.
     */
    public DynamicProperties(final String path) {
        this(path == null ? null : new File(path));
    }

    /**

    Iterable<String> set = newHashSet("a", null, "b");
    assertTrue(FluentIterable.from(set).contains(null));
  }

  public void testContains_nullSetNo() {
    Iterable<String> set = ImmutableSortedSet.of("a", "b");
    assertFalse(FluentIterable.from(set).contains(null));
  }

  public void testContains_nullIterableYes() {
    Iterable<String> iterable = iterable("a", null, "b");

        assertNotNull(readings);
        assertTrue(readings.isEmpty());
    }

    @Test
    public void testConvertWithNullText() throws IOException {
        // Test convert with null text
        converter.init();
        String text = null;
        String field = "content";

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

        assertNotNull(readings);
        assertTrue(readings.isEmpty());