private void orderContainedMethods()

in junit-jupiter-engine/src/main/java/org/junit/jupiter/engine/discovery/MethodOrderingVisitor.java [66:122]
43 lines of code
3 McCabe index (conditional complexity)

	private void orderContainedMethods(ClassBasedTestDescriptor classBasedTestDescriptor, Class<?> testClass) {
		findAnnotation(testClass, TestMethodOrder.class)//
				.map(TestMethodOrder::value)//
				.<MethodOrderer> map(ReflectionUtils::newInstance)//
				.map(Optional::of)//
				.orElseGet(configuration::getDefaultTestMethodOrderer)//
				.ifPresent(methodOrderer -> {

					Set<? extends TestDescriptor> children = classBasedTestDescriptor.getChildren();

					List<TestDescriptor> nonMethodTestDescriptors = children.stream()//
							.filter(testDescriptor -> !(testDescriptor instanceof MethodBasedTestDescriptor))//
							.collect(Collectors.toList());

					List<DefaultMethodDescriptor> methodDescriptors = children.stream()//
							.filter(MethodBasedTestDescriptor.class::isInstance)//
							.map(MethodBasedTestDescriptor.class::cast)//
							.map(DefaultMethodDescriptor::new)//
							.collect(toCollection(ArrayList::new));

					// Make a local copy for later validation
					Set<DefaultMethodDescriptor> originalMethodDescriptors = new LinkedHashSet<>(methodDescriptors);

					methodOrderer.orderMethods(
						new DefaultMethodOrdererContext(methodDescriptors, testClass, this.configuration));

					int difference = methodDescriptors.size() - originalMethodDescriptors.size();

					if (difference > 0) {
						logger.warn(() -> String.format(
							"MethodOrderer [%s] added %s MethodDescriptor(s) for test class [%s] which will be ignored.",
							methodOrderer.getClass().getName(), difference, testClass.getName()));
					}
					else if (difference < 0) {
						logger.warn(() -> String.format(
							"MethodOrderer [%s] removed %s MethodDescriptor(s) for test class [%s] which will be retained with arbitrary ordering.",
							methodOrderer.getClass().getName(), -difference, testClass.getName()));
					}

					Set<TestDescriptor> sortedMethodTestDescriptors = methodDescriptors.stream()//
							.filter(originalMethodDescriptors::contains)//
							.map(DefaultMethodDescriptor::getTestDescriptor)//
							.collect(toCollection(LinkedHashSet::new));

					// Currently no way to removeAll or addAll children at once.
					Stream.concat(sortedMethodTestDescriptors.stream(), nonMethodTestDescriptors.stream())//
							.forEach(classBasedTestDescriptor::removeChild);
					Stream.concat(sortedMethodTestDescriptors.stream(), nonMethodTestDescriptors.stream())//
							.forEach(classBasedTestDescriptor::addChild);

					// Note: MethodOrderer#getDefaultExecutionMode() is guaranteed
					// to be invoked after MethodOrderer#orderMethods().
					methodOrderer.getDefaultExecutionMode()//
							.map(JupiterTestDescriptor::toExecutionMode)//
							.ifPresent(classBasedTestDescriptor::setDefaultChildExecutionMode);
				});
	}