Add clarifying comments

Author: mpkorstanje

platform-tests/src/test/java/org/junit/platform/engine/UniqueIdTests.java

@@ -24,6 +24,7 @@
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;
 import java.util.Base64;
+import java.util.List;
 import java.util.Optional;
 
 import org.junit.jupiter.api.Nested;
@@ -318,7 +319,14 @@ void roundTrip() throws IOException, ClassNotFoundException {
 		}
 
 		@Test
-		void deserializeromJunit60() throws IOException, ClassNotFoundException {
+		void deserializeFromJunit60() throws IOException, ClassNotFoundException {
+			/*
+			 Serialized representation of:
+			 	new UniqueId(
+			 		new UniqueIdFormat('[', ':', ']', '/'),
+			 		List.of(new Segment("engine", "junit-jupiter"))
+			 );
+			 */
 			var uniqueIdFromJunit60 = Base64.getMimeDecoder().decode("""
 					rO0ABXNyACJvcmcuanVuaXQucGxhdGZvcm0uZW5naW5lLlVuaXF1ZUlkAAAAAAAAAAECAAJMAAhzZWdtZW50c3QAEExqYXZhL3V0
 					aWwvTGlzdDtMAA51bmlxdWVJZEZvcm1hdHQAKkxvcmcvanVuaXQvcGxhdGZvcm0vZW5naW5lL1VuaXF1ZUlkRm9ybWF0O3hwc3IA
@@ -343,6 +351,13 @@ void deserializeromJunit60() throws IOException, ClassNotFoundException {
 
 		@Test
 		void deserializeFromJunit60IgnoresCustomFormat() throws IOException, ClassNotFoundException {
+			/*
+			  Serialized representation of:
+				new UniqueId(
+					new UniqueIdFormat('{', '=', '}', ','),
+					List.of(new Segment("engine", "junit-jupiter"))
+			 );
+			 */
 			var uniqueIdWithCustomFormatFromJunit60 = Base64.getMimeDecoder().decode("""
 					rO0ABXNyACJvcmcuanVuaXQucGxhdGZvcm0uZW5naW5lLlVuaXF1ZUlkAAAAAAAAAAECAAJMAAhzZWdtZW50c3QAEExqYXZhL3V0
 					aWwvTGlzdDtMAA51bmlxdWVJZEZvcm1hdHQAKkxvcmcvanVuaXQvcGxhdGZvcm0vZW5naW5lL1VuaXF1ZUlkRm9ybWF0O3hwc3IA