Introduce experimental memory cleanup mode

[marcphilipp]

Issue: #5344

[mpkorstanje]

    public static void main(String[] args) {
        SummaryGeneratingListener listener = new SummaryGeneratingListener();
        LauncherFactory.create()
                .execute(LauncherDiscoveryRequestBuilder.discoveryRequest()
                        .selectors(DiscoverySelectors.selectClass(RunCucumberTest.class))
                        .build(), listener);

        listener.getSummary()
                .printFailuresTo(new PrintWriter(System.out));
    }

Exception in thread "main" org.junit.platform.commons.PreconditionViolationException: No TestIdentifier with unique ID [[engine:junit-platform-suite]/[suite:com.example.project.RunCucumberTest]/[engine:cucumber]/[feature:classpath%3Acom%2Fexample%2Fproject%2Fbelly.feature]] has been added to this TestPlan.
	at org.junit.platform.commons.util.Preconditions.condition(Preconditions.java:389)
	at org.junit.platform.commons.util.Preconditions.notNull(Preconditions.java:74)
	at org.junit.platform.launcher.TestPlan.getTestIdentifier(TestPlan.java:212)
	at java.base/java.util.Optional.map(Optional.java:260)
	at org.junit.platform.launcher.TestPlan.getParent(TestPlan.java:155)
	at org.junit.platform.launcher.listeners.MutableTestExecutionSummary.collectTestDescription(MutableTestExecutionSummary.java:229)
	at org.junit.platform.launcher.listeners.MutableTestExecutionSummary.describeTest(MutableTestExecutionSummary.java:223)
	at org.junit.platform.launcher.listeners.MutableTestExecutionSummary.lambda$printFailuresTo$0(MutableTestExecutionSummary.java:207)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
	at java.base/java.util.Collections$SynchronizedCollection.forEach(Collections.java:2361)
	at org.junit.platform.launcher.listeners.MutableTestExecutionSummary.printFailuresTo(MutableTestExecutionSummary.java:206)
	at org.junit.platform.launcher.listeners.MutableTestExecutionSummary.printFailuresTo(MutableTestExecutionSummary.java:196)
	at com.example.project.RunCucumberTest.main(RunCucumberTest.java:36)

edit: Likewise

    public static void main(String[] args) throws IOException {
        ConsoleLauncher.main("execute", "--select-package", "com.example.project");
    }

But at least the tree summary works. 😄

╷
├─ Cucumber ✔
│  └─ Belly ✔
│     └─ a few cukes ✘ T
└─ JUnit Platform Suite ✔
   └─ RunCucumberTest ✔
      └─ Cucumber ✔
         └─ Belly ✔
            └─ a few cukes ✘ T

Failures (2):
No TestIdentifier with unique ID [[engine:cucumber]/[feature:classpath%3Acom%2Fexample%2Fproject%2Fbelly.feature]] has been added to this TestPlan.

[marcphilipp]

@mpkorstanje I pushed 48f77bb to fix the exception reported above.

[mpkorstanje]

The description could be made part of the DefaultFailure.

[marcphilipp]

I didn't want to break serialization compatiblity