Add metadata to messages emitted by live tests.

lib/src/runner/load_suite.dart

Index: lib/src/runner/load_suite.dart
diff --git a/lib/src/runner/load_suite.dart b/lib/src/runner/load_suite.dart
index 97a2ba40bd45a5c1d89ac00e371399708c835d7d..242c6324db88cd2b088a65e5b1db957579d1b710 100644
--- a/lib/src/runner/load_suite.dart
+++ b/lib/src/runner/load_suite.dart
@@ -156,7 +156,7 @@ class LoadSuite extends Suite implements RunnerSuite {
   /// through the return value.
   Future<RunnerSuite> getSuite() async {
     var liveTest = await test.load(this);
-    liveTest.onPrint.listen(print);
+    liveTest.onMessage.listen((message) => print(message.text));
     await liveTest.run();
 
     if (liveTest.errors.isEmpty) return await suite;