Display metadata about out-of-band callbacks in scheduled test errors.

pkg/scheduled_test/lib/scheduled_process.dart

Index: pkg/scheduled_test/lib/scheduled_process.dart
diff --git a/pkg/scheduled_test/lib/scheduled_process.dart b/pkg/scheduled_test/lib/scheduled_process.dart
index 35cb4d855bdab3653c2e75082e0b7d7913bf62dd..799903f75d4a211abca197ff34d8a18d772102a5 100644
--- a/pkg/scheduled_test/lib/scheduled_process.dart
+++ b/pkg/scheduled_test/lib/scheduled_process.dart
@@ -172,7 +172,8 @@ class ScheduledProcess {
           throw "Process '${this.description}' ended earlier than scheduled "
             "with exit code $exitCode.";
         }
-      }));
+      }), "waiting to reach shouldExit() or kill() for process "
+          "'${this.description}'");

[Bob Nystrom, 2013/03/12 20:08:51]

Is "this." still needed here (and above)?

[nweiz, 2013/03/12 20:56:51]

Nope. Done.

     });
   }
 
@@ -202,7 +203,8 @@ class ScheduledProcess {
         _process.value.kill();
         // Ensure that the onException queue waits for the process to actually
         // exit after being killed.
-        wrapFuture(_process.value.exitCode);
+        wrapFuture(_process.value.exitCode, "waiting for process "
+            "'${this.description}' to die");

[Bob Nystrom, 2013/03/12 20:08:51]

Ditto.

[nweiz, 2013/03/12 20:56:51]

Done.

       }
 
       return Future.wait([