Issue: #3139 Add number reference to each test

Author: XJ114514

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

@@ -35,7 +35,8 @@ public DiffPrinter(TestPlan testPlan) {
 
 	//print the difference of two print to out
 	void printDiff(PrintWriter out, String expected, String actual, TestIdentifier testIdentifier) {
-		out.printf("  %s:", describeTest(testIdentifier));
+		char id = testIdentifier.getUniqueId().charAt(testIdentifier.getUniqueId().length() - 4);
+		out.printf(" (%c) %s:", id == 's' ? '1' : id, describeTest(testIdentifier));
 		boolean inlineDiffByWordFlag = false;
 		if (expected.contains(" ") || actual.contains(" ")) {
 			inlineDiffByWordFlag = true;

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

@@ -203,7 +203,8 @@ public void printFailuresTo(PrintWriter writer, int maxStackTraceLines) {
 		if (getTotalFailureCount() > 0) {
 			writer.printf("%nFailures (%d):%n", getTotalFailureCount());
 			this.failures.forEach(failure -> {
-				writer.printf("%s%s%n", TAB, describeTest(failure.getTestIdentifier()));
+				writer.printf("%s(%c) %s%n", TAB, getTestId(failure.getTestIdentifier()),
+					describeTest(failure.getTestIdentifier()));
 				printSource(writer, failure.getTestIdentifier());
 				writer.printf("%s=> %s%n", DOUBLE_TAB, failure.getException());
 				printStackTrace(writer, failure.getException(), maxStackTraceLines);
@@ -223,6 +224,12 @@ private String describeTest(TestIdentifier testIdentifier) {
 		return join(":", descriptionParts);
 	}
 
+	//return the unique id of the test
+	private char getTestId(TestIdentifier testIdentifier) {
+		char id = testIdentifier.getUniqueId().charAt(testIdentifier.getUniqueId().length() - 4);
+		return id == 's' ? '1' : id;
+	}
+
 	private void collectTestDescription(TestIdentifier identifier, List<String> descriptionParts) {
 		descriptionParts.add(0, identifier.getDisplayName());
 		this.testPlan.getParent(identifier).ifPresent(parent -> collectTestDescription(parent, descriptionParts));