[folks] When a test would print a message >= warning, print a stack trace.

[Travis Reitter <treitter src gnome org>]

commit 56c99d93af9191ed47cb05d0daec8c11ed060ad7
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Mon Jan 10 16:40:14 2011 -0800

    When a test would print a message >= warning, print a stack trace.
    
    This is largely to benefit remote debugging of build bots but also makes
    debugging test errors easier.
    
    Helps bgo#639195 - Print stack traces for failed tests to improve
    remote debugging

 tests/lib/test-case.vala |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/tests/lib/test-case.vala b/tests/lib/test-case.vala
index 0015ef4..0ace778 100644
--- a/tests/lib/test-case.vala
+++ b/tests/lib/test-case.vala
@@ -68,9 +68,26 @@ public abstract class Folks.TestCase : Object {
 		}
 
 		public void set_up (void* fixture) {
+			Log.set_default_handler (this._log_func_stack_trace);
+
 			this.test_case.set_up ();
 		}
 
+		private void _log_func_stack_trace (string? log_domain,
+				LogLevelFlags log_levels,
+				string message) {
+			Log.default_handler (log_domain, log_levels, message);
+
+			/* Print a stack trace for any message at the warning level or above */
+			if ((log_levels &
+					(LogLevelFlags.LEVEL_WARNING | LogLevelFlags.LEVEL_ERROR |
+							LogLevelFlags.LEVEL_CRITICAL))
+					!= 0) {
+					GLib.on_error_stack_trace ("libtool --mode=execute gdb");
+				}
+		}
+
+
 		public void run (void* fixture) {
 			this.test ();
 		}