Issue: junit-team#3139 Update to display each test method info

1. Add a `testPlan` getter to `platform/launcher/listeners/SummaryGeneratingListener.java`.

2. DiffPrinter now needs testPlan to display the testMethod info.
Issue: junit-team#3139

junit-platform-console/src/main/java/org/junit/platform/console/tasks/ConsoleTestExecutor.java

@@ -49,6 +49,8 @@ public class ConsoleTestExecutor {
 	private final TestConsoleOutputOptions outputOptions;
 	private final Supplier<Launcher> launcherSupplier;
 
+	private TestPlan testPlanListeners;
+
 	public ConsoleTestExecutor(TestDiscoveryOptions discoveryOptions, TestConsoleOutputOptions outputOptions) {
 		this(discoveryOptions, outputOptions, LauncherFactory::create);
 	}
@@ -79,7 +81,6 @@ private void discoverTests(PrintWriter out) {
 
 		LauncherDiscoveryRequest discoveryRequest = new DiscoveryRequestCreator().toDiscoveryRequest(discoveryOptions);
 		TestPlan testPlan = launcher.discover(discoveryRequest);
-
 		commandLineTestPrinter.ifPresent(printer -> printer.listTests(testPlan));
 		if (outputOptions.getDetails() != Details.NONE) {
 			printFoundTestsSummary(out, testPlan);
@@ -103,6 +104,8 @@ private TestExecutionSummary executeTests(PrintWriter out, Optional<Path> report
 		launcher.execute(discoveryRequest);
 		TestExecutionSummary summary = summaryListener.getSummary();
 		if (summary.getTotalFailureCount() > 0 || outputOptions.getDetails() != Details.NONE) {
+			//get testPlan from summaryListener
+			testPlanListeners = summaryListener.getTestPlan();
 			printSummary(summary, out);
 		}
 
@@ -182,6 +185,7 @@ private void printSummary(TestExecutionSummary summary, PrintWriter out) {
 		if (EnumSet.of(Details.NONE, Details.SUMMARY, Details.TREE).contains(outputOptions.getDetails())) {
 			summary.printFailuresTo(out);
 			//adding diff code here
+			out.printf("%nDiffs (Markdown):%n");
 			summary.getFailures().forEach(failure -> {
 				//get AssertionFailedError
 				if (failure.getException() instanceof AssertionFailedError) {
@@ -190,10 +194,8 @@ private void printSummary(TestExecutionSummary summary, PrintWriter out) {
 					ValueWrapper actual = assertionFailedError.getActual();
 					//apply diff function
 					if (isCharSequence(expected) && isCharSequence(actual)) {
-						out.printf("%nDiffs (Markdown):%n");
-						out.printf("  %s:", failure.getTestIdentifier().getDisplayName());
-						DiffPrinter.printDiff(out, expected.getStringRepresentation(),
-							actual.getStringRepresentation());
+						new DiffPrinter(testPlanListeners).printDiff(out, expected.getStringRepresentation(),
+							actual.getStringRepresentation(), failure.getTestIdentifier());
 					}
 
 				}

junit-platform-console/src/main/java/org/junit/platform/console/tasks/DiffPrinter.java

@@ -10,19 +10,32 @@
 
 package org.junit.platform.console.tasks;
 
+import static java.lang.String.join;
+
 import java.io.PrintWriter;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
 import com.github.difflib.text.DiffRow;
 import com.github.difflib.text.DiffRowGenerator;
 
+import org.junit.platform.launcher.TestIdentifier;
+import org.junit.platform.launcher.TestPlan;
+
 /**
  * class provide access to printDiff function
  */
 class DiffPrinter {
+	private final TestPlan testPlan;
+
+	public DiffPrinter(TestPlan testPlan) {
+		this.testPlan = testPlan;
+	}
+
 	//print the difference of two print to out
-	static void printDiff(PrintWriter out, String expected, String actual) {
+	void printDiff(PrintWriter out, String expected, String actual, TestIdentifier testIdentifier) {
+		out.printf("  %s:", describeTest(testIdentifier));
 		boolean inlineDiffByWordFlag = false;
 		if (expected.contains(" ") || actual.contains(" ")) {
 			inlineDiffByWordFlag = true;
@@ -38,4 +51,15 @@ static void printDiff(PrintWriter out, String expected, String actual) {
 			out.println();
 		}
 	}
+
+	private String describeTest(TestIdentifier testIdentifier) {
+		List<String> descriptionParts = new ArrayList<>();
+		collectTestDescription(testIdentifier, descriptionParts);
+		return join(":", descriptionParts);
+	}
+
+	private void collectTestDescription(TestIdentifier identifier, List<String> descriptionParts) {
+		descriptionParts.add(0, identifier.getDisplayName());
+		testPlan.getParent(identifier).ifPresent(parent -> collectTestDescription(parent, descriptionParts));
+	}
 }

junit-platform-launcher/src/main/java/org/junit/platform/launcher/listeners/SummaryGeneratingListener.java

@@ -46,6 +46,13 @@ public TestExecutionSummary getSummary() {
 		return this.summary;
 	}
 
+	/**
+	 * Get the testPlan of this listener.
+	 */
+	public TestPlan getTestPlan() {
+		return testPlan;
+	}
+
 	@Override
 	public void testPlanExecutionStarted(TestPlan testPlan) {
 		this.testPlan = testPlan;