return this;
    }

    @Override
    public Set<Object> getBuiltBy() {
        return buildDependency.getMutableValues();
    }

    @Override
    public ConfigurableFileTree setBuiltBy(Iterable<?> tasks) {
        buildDependency.setValues(tasks);
        return this;
    }

     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.
     * @return this
     */
    ConfigurableFileTree setBuiltBy(Iterable<?> tasks);

    /**
     * Registers some tasks which build the files of this collection.
     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.

     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.
     * @return this
     */
    ConfigurableFileCollection setBuiltBy(Iterable<?> tasks);

    /**
     * Registers some tasks which build the files of this collection.
     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.

        fileTree.builtBy("b")
        fileTree.from("f")
        then:
        fileTree.getBuiltBy() == ["a", "b"] as Set
        dep.mutableValues == ["a", "b"] as Set

        when:
        fileTree.setBuiltBy(["c"])
        then:
        fileTree.getBuiltBy() == ["c"] as Set
        dep.mutableValues == ["c"] as Set

        when:
        fileTree.visitDependencies(context)

        then:

        return this;
    }

    @Override
    public Set<Object> getBuiltBy() {
        return buildDependency.getMutableValues();
    }

    @Override
    public ConfigurableFileCollection setBuiltBy(Iterable<?> tasks) {
        buildDependency.setValues(tasks);
        return this;
    }

    private void calculateFinalizedValue() {

        collection.builtBy("a")
        collection.builtBy("b")
        collection.from("f")

        then:
        collection.builtBy == ["a", "b"] as Set<Object>

        when:
        collection.setBuiltBy(["c"])

        then:
        collection.builtBy == ["c"] as Set<Object>

        when:
        def dependencies = collection.buildDependencies.getDependencies(null)

        then: