[source]
----
$ ./gradlew :app:hello

> Task :app:compileJava UP-TO-DATE
> Task :app:processResources NO-SOURCE
> Task :app:classes UP-TO-DATE
> Task :app:jar UP-TO-DATE
> Task :app:startScripts UP-TO-DATE
> Task :app:distTar UP-TO-DATE
> Task :app:distZip UP-TO-DATE
> Task :app:assemble UP-TO-DATE

> Task :app:hello
Hello world!
----

        }

        then: "task progress events must be forwarded to the attached listeners"
        !events.tasks.empty
        events.operations == events.tasks
    }

    def "receive current task progress event even if one of multiple task listeners throws an exception"() {
        given:
        goodCode()

        """
    }

    def "default cacheability is BUILD_CACHE_DISABLED"() {
        buildFile << """
            task cacheable(type: Cacheable) {}
            task notCacheableByDefault(type: NotCacheableByDefault) {}
            task unspecified(type: UnspecifiedCacheabilityTask) {}
            task noOutputs(type: NoOutputs) {}
        """
        when:
        run "cacheable"
        then:

    private static void addEntryTasksTo(ExecutionPlan plan, Set<Task> allTasksToRun) {
        for (Task task : allTasksToRun) {
            plan.addEntryTask(task);
        }
    }

    private void configureTestTasks(Set<Task> tasks) {
        for (Task task : tasks) {
            if (task instanceof AbstractTestTask) {
                configureTestTask((AbstractTestTask) task);
            }
        }
    }

        tasks.withType(AsciidoctorTask.class).configureEach(task -> {
            if (task.getName().equals("asciidoctor")) {
                // ignore this task
                task.setEnabled(false);
                return;
            }

            task.setExecutionMode(ExecutionMode.OUT_OF_PROCESS);
            task.outputOptions(options -> {
                options.setSeparateOutputDirs(false);

    }
}

extensions.create('custom', SomeExtension)

task useIntTypeDsl {
    def custom = project.custom
    doLast {
        custom.prop = 123
    }
}

task useIntTypeApi {
    def custom = project.custom
    doLast {
        custom.prop.set(123)
    }
}

task useFileTypeDsl {
    def custom = project.custom
    def layout = project.layout
    doLast {

        withInstallations(jdkMetadata).fails(task)
        def events = toolchainEvents(task)
        then:
        failureDescriptionStartsWith("Execution failed for task '${task}'.")
        failureHasCause("There were failing tests.")
        assertToolchainUsages(events, jdkMetadata, "JavaLauncher")
    }

    def "emits toolchain usages when task fails for 'javadoc' task"() {
        def task = ":javadoc"

        then:
        result.groupedOutput.task(":a:some").assertOutputContains("FIRST").assertOutputContains("LAST")
        result.groupedOutput.task(":a:other").assertOutputContains("OTHER")

        when:
        configurationCacheRun ":a:some", ":a:other"

        then:
        result.groupedOutput.task(":a:some").assertOutputContains("FIRST").assertOutputContains("LAST")
        result.groupedOutput.task(":a:other").assertOutputContains("OTHER")

		tasks := t.summary.Tasks

		// Summarize groups of tasks with the same name.
		summary := make(map[string]taskStats)
		for _, task := range tasks {
			stats, ok := summary[task.Name]
			if !ok {
				stats.Type = task.Name
			}
			stats.add(task)
			summary[task.Name] = stats
		}

		// Sort tasks by type.
		userTasks := make([]taskStats, 0, len(summary))
		for _, stats := range summary {

        }

        @Override
        public void execute(Task task) {
            if (application == null) {
                doExecute(task);
            } else {
                application.reapply(() -> doExecute(task));
            }
        }

        private void doExecute(Task task) {
            closure.setDelegate(task);
            closure.setResolveStrategy(Closure.DELEGATE_FIRST);