1 * action.execute(task)
        0 * action._

        expect:
        elements.calculateExecutionTimeValue().hasChangingContent()
    }

    void "visits self when listener requests contents"() {
        def collection = new TestFileCollection()
        def visitor = Mock(FileCollectionStructureVisitor)

        when:
        collection.visitStructure(visitor)

        then:

        when:
        run "myTask", "--debug"
        then:
        assertWatchedHierarchies([testDirectory])
        result.assertNotPostBuildOutput("Some of the file system contents retained in the virtual file system are on file systems that Gradle doesn't support watching.")
    }

    @Requires(UnitTestPreconditions.Windows)
    def "does not start watching on unsupported file system"() {

        return objectFileDir;
    }

    /**
     * Returns the header directories to be used for compilation.
     */
    @Internal("The paths for include directories are tracked via the includePaths property, the contents are tracked via discovered inputs")
    public ConfigurableFileCollection getIncludes() {
        return includes;
    }

    /**
     * Add directories where the compiler should search for header files.

        return setFoo(setBar(bar))
    }

    static String setBar(String bar) {
        return "bar = \"${bar}\"\n"
    }

    static String setFoo(String contents) {
        return "foo {\n${contents}\n}"
    }

    static String setAll(String id, String bar) {
        return setId(id) + "\n" + setFooBar(bar)
    }

    static String addToList(String item) {

        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    /**
     * Reads and returns file contents. If some exception is triggered the method returns information about this exception.
     * Useful for including file contents in debug trace / exception messages.
     *
     * @param file to read
     * @return content of the file or the problem description in case file cannot be read.

        this.containers.addAll(Arrays.asList(containers));
    }

    /**
     * Enables advanced configuration like tinkering with the output XML or affecting the way
     * that the contents of an existing .classpath file is merged with Gradle build information.
     * The object passed to the whenMerged{} and beforeMerged{} closures is of type {@link Classpath}.
     * <p>

        if (fileName.startsWith('maven-metadata.xml')) {
            if (fileName == 'maven-metadata.xml') {
                return clearLastUpdatedElementOf(repositoryFile.text)
            }
            // Ignore contents of maven-metadata.xml.sha256, etc, because hashes will most likely
            // change between runs due to <lastUpdated /> differences.
            return ''
        }
        return repositoryFile.text
    }

        !result
        0 * onAccess._
        0 * onChange._
        0 * onRemove._
    }

    private static Properties propertiesWithContent(Map<String, String> contents) {
        Properties props = new Properties()
        props.putAll(contents)
        return props
    }

    // Shortcut to have a typed lambda expression in where: block
    private static Consumer<Properties> call(Consumer<Properties> consumer) {

If you use the `@Input` annotation on a file-based property, Gradle wouldn't consider the file contents, or the directory contents, as inputs, as you might expect.

        where:
        type                      | creationCommand
        "empty directory"         | { TestFile output -> output.createDir() }
        "directory with contents" | { TestFile output ->
            output.create {
                file("first-file").text = "leftover file"
                file("second-file").text = "leftover file"
            }
        }