}

    def "trivial content change"() {
        expect:
        changes(
            regularFile("one", 0x1234),
            regularFile("one", 0xffff)
        ) == [modified("one")]
    }

    def "deep equality"() {
        expect:
        changes(
            directory("root", [
                regularFile("root/one", 0x1234),
                regularFile("root/two", 0x2345)

   *
   * @return {@code true} if the graph was modified as a result of this call
   */
  @CanIgnoreReturnValue
  boolean removeNode(N node);

  /**
   * Removes the edge connecting {@code nodeU} to {@code nodeV}, if it is present.
   *
   * @return {@code true} if the graph was modified as a result of this call
   */
  @CanIgnoreReturnValue
  boolean removeEdge(N nodeU, N nodeV);

                if (!itemComparator.hasSameContent(previousItem, currentItem)) {
                    Change modified = changeFactory.modified(currentAbsolutePath, propertyTitle, previousItem, currentItem);
                    if (!visitor.visitChange(modified)) {
                        return false;
                    }
                }
                // else, unchanged; check next file

    }

    public static DefaultFileChange modified(String path, String title, FileType previousFileType, FileType currentFileType, String normalizedPath) {
        return new DefaultFileChange(path, ChangeTypeInternal.MODIFIED, title, previousFileType, currentFileType, normalizedPath);
    }

        MockResponse.Builder()
          .addHeader("Last-Modified: $lastModifiedDate")
          .addHeader("Date: " + formatDate(-15, TimeUnit.SECONDS))
          .build(),
      )
    assertThat(conditionalRequest.headers["If-Modified-Since"])
      .isEqualTo(lastModifiedDate)
  }

  @Test
  fun defaultExpirationDateFullyCachedForMoreThan24Hours() {
    //      last modified: 105 days ago
    //             served:   5 days ago

        parent.setArtifactId("apache");
        parent.setVersion("(,2.0)");

        AtomicReference<org.apache.maven.api.model.Parent> modified = new AtomicReference<>();
        assertNotNull(this.newModelResolver().resolveModel(parent.getDelegate(), modified));
        assertEquals("1", modified.get().getVersion());
    }

    @Test
    void testResolveDependencyThrowsUnresolvableModelExceptionWhenNotFound() throws Exception {

		"from":                        37,
		"host":                        38,
		"if-match":                    39,
		"if-modified-since":           40,
		"if-none-match":               41,
		"if-range":                    42,
		"if-unmodified-since":         43,
		"last-modified":               44,
		"link":                        45,
		"location":                    46,
		"max-forwards":                47,

        }
        then:
        executesIncrementally("""
            ext.removed = ['third']
            ext.modified = ['first', 'second']
        """)
    }

    private void setupBuildFile() {
        buildFile .text = """
            ext {
                added = []
                modified = []
                removed = []
                incremental = true
                registerNewOutput = false

                    protected boolean exec() {
                        try {
                            AtomicReference<Parent> modified = new AtomicReference<>();
                            ModelSource source = doResolveModel(parent, modified);
                            result = new Result(source, modified.get(), null);
                        } catch (Exception e) {
                            result = new Result(null, null, e);

! stdout vcs.revision
! stdout vcs.time
stdout '^\tbuild\tvcs.modified=true$'
cd ..

# Revision and commit time are tagged for repositories with commits.
exec hg add a README
exec hg commit -m 'initial commit'
cd a
go install
go version -m $GOBIN/a$GOEXE
stdout '^\tbuild\tvcs.revision='
stdout '^\tbuild\tvcs.time='
stdout '^\tbuild\tvcs.modified=false$'
rm $GOBIN/a$GOEXE