given:
        file('dir1/path/file.txt').createFile() << 'f1'
        file('dir2/path/file.txt').createFile() << 'f2'
        buildScript '''
            task copy(type: Copy) {
                from 'dir1'
                from 'dir2'
                into 'dest'
            }
        '''.stripIndent()

        when:
        fails 'copy'

		t.Error("expected false for non-existent directory, got true")
	}

	// Should give false for not-a-directory.
	dir2 := slashpath.Join(tmp, "file")
	err := os.WriteFile(dir2, []byte("hello"), 0o777)
	if err != nil {
		t.Fatal(err)
	}

	if isDirEmpty(dir2, true) {
		t.Error("expected false for a file, got true")
	}

	// Should give true for a real empty directory.

    val dir1 = cacheDir / "dir1"
    val dir2 = dir1 / "dir2"
    writeFile(getCleanFile("g1", 0), "A")
    writeFile(getCleanFile("g1", 1), "B")
    writeFile(getCleanFile("g2", 0), "C")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(cacheDir / "otherFile0", "E")
    writeFile(dir2 / "otherFile1", "F")
  }

        assertEquals(new File(pom.getBasedir(), "src/test/dir1"), new File((String) pom.getValue("properties/dir1")));
        assertEquals(
                new File(pom.getBasedir(), "target/site/dir2"), new File((String) pom.getValue("properties/dir2")));
    }

    @Test
    void testAppendArtifactIdOfChildToInheritedUrls() throws Exception {
        PomTestWrapper pom = buildPom("url-inheritance/sub");

        _ * producer1.outputDirectory >> file("dir1")
        Task producer2 = task("producer2", type: AsyncWithOutputDirectory)
        _ * producer2.outputDirectory >> file("dir2")
        Task destroyer = task("destroyer", type: AsyncWithDestroysFile)
        _ * destroyer.destroysFile >> file("dir3")

        when:
        addToGraphAndPopulate(destroyer, producer1, producer2)