DependencyResolverRequest.build(session, DependencyResolverRequest.RequestType.FLATTEN, project));
    }

    @Nonnull
    default DependencyResolverResult flatten(
            @Nonnull Session session, @Nonnull Project project, @Nonnull PathScope scope) {
        return flatten(DependencyResolverRequest.build(
                session, DependencyResolverRequest.RequestType.FLATTEN, project, scope));
    }

        } catch (DependencyCollectionException e) {
            throw new DependencyResolverException("Unable to collect dependencies", e);
        }
    }

    @Override
    public List<Node> flatten(Session s, Node node, PathScope scope) throws DependencyResolverException {
        InternalSession session = InternalSession.from(s);
        DependencyNode root = cast(AbstractNode.class, node, "node").getDependencyNode();

        mainTestedVersions = testedVersions.map { VersionNumber.parse(it.gradleVersion().version) }
            .groupBy { it.major }
            .map { (_, v) -> listOf(v.minOrNull()!!.format(), v.maxOrNull()!!.format()) }.flatten()
    }

    private
    fun VersionNumber.format() =
        // reformat according to our versioning scheme, since toString() would typically convert 1.0 to 1.0.0

            return transformStepNodeIdentities
        }
        def targetColors = (identities.collect { it*.targetAttributes.color }.flatten() as Set<String>)
        return targetColors.collectEntries { color ->
            [(color): identities.collect {plannedTransformSteps ->

        return [true, false]
    }

    final def testCasesWithIndyModes() {
        // Combine each test case with enableIndy=true and/or enableIndy=false
        return [testCases(), indyModes()].combinations().collect { it.flatten() }
    }

    def "#title is intercepted in groovy build script #indyStatus"(VarInitializer varInitializer) {
        given:
        def cwd = testDirectory.file(expectedPwdSuffix)
        withPluginCode("""

     *
     * @return the id of the path scope
     */
    String pathScope() default "";

    /**
     * The request type, in case the default one is not correct.
     * Valid values are {@code collect}, {@code flatten}, or {@code resolve}.
     *
     * @return the request type
     */
    String requestType() default "";

          <type>String</type>
          <description>pathScope used to flatten dependencies</description>
        </field>
        <field>
          <name>requestType</name>
          <required>false</required>
          <version>2.0.0+</version>
          <type>String</type>
          <description>either {@code collect}, {@code flatten}, or {@code resolve}</description>
        </field>
      </fields>
    </class>

                    def walker = services.get(PropertyWalker)
                    TaskPropertyUtils.visitProperties(walker, this, visitor)
                    def inputFiles = visitor.fileProperties*.propertyFiles*.files.flatten()
                    assert inputFiles.empty
                }
            }

            task customTask(type: CustomTask) {
                input = null
            }
        """

        expect:

 *
 * @since 4.0.0
 */
@Experimental
@Immutable
public interface DependencyResolverRequest {

    enum RequestType {
        COLLECT,
        FLATTEN,
        RESOLVE
    }

    @Nonnull
    Session getSession();

    @Nonnull
    RequestType getRequestType();

    @Nonnull
    Optional<Project> getProject();

    @Nonnull

     */
    @Nonnull
    Node collectDependencies(@Nonnull DependencyCoordinate dependency);

    /**
     * Shortcut for {@code getService(DependencyResolver.class).flatten(...)}.
     *
     * @param node node for which to get a flattened list
     * @param scope build path scope (main compile, test compile, etc.) of desired nodes