[banshee] MediaEngineTests: improve information about failed tests

[Andrés Aragoneses <aaragoneses src gnome org>]

commit 36c9677192b938ffa89f145b6902d3ecdbdb222f
Author: Andrés G. Aragoneses <knocte gmail com>
Date:   Mon Jan 20 01:36:34 2014 +0100

    MediaEngineTests: improve information about failed tests
    
    The AssertionException recently captured in previous commit had
    line numbers referring to the exact place in the
    Action<PlayerEventArgs> handler where it failed, but its stack
    trace didn't go deep enough to tell us which lines the callers
    of AssertTransition come from.
    
    The way to fix it is to create a new exception object in the
    non-handler thread, which copies the exception message of the
    captured assertion exception (and stores it as inner exception
    too, just in case).
    
    We also add a message to the Asserts in the handler in order
    to distinguish better if we're comparing an event or a state.

 .../Banshee.Services/Banshee.MediaEngine/Tests.cs  |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs 
b/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
index 7f299da..62aae88 100644
--- a/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
+++ b/src/Core/Banshee.Services/Banshee.MediaEngine/Tests.cs
@@ -191,11 +191,12 @@ namespace Banshee.MediaEngine
                         var evnt = (states[result_count] as PlayerEvent?) ?? PlayerEvent.StateChange;
                         var state = states[result_count] as PlayerState?;
 
-                        result_count++;
-                        Assert.AreEqual (evnt, last_event);
+                        Assert.That (last_event, Is.EqualTo (evnt), String.Format ("Event[{0}] doesn't 
match", result_count));
                         if (state != null) {
-                            Assert.AreEqual (state, last_state);
+                            Assert.That (last_state, Is.EqualTo (state), String.Format ("State[{0}] doesn't 
match", result_count));
                         }
+
+                        result_count++;
                     }
                 }
                 reset_event.Set ();
@@ -221,7 +222,7 @@ namespace Banshee.MediaEngine
                     break;
                 }
                 if (exception != null) {
-                    throw exception;
+                    throw new AssertionException (exception.Message, exception);
                 }
             }