[gnome-keyring] HACKING: Update with description of how to run tests

[Stefan Walter <stefw src gnome org>]

commit a909e7a5b0cf1f02d498ff6475aad4173409c3b0
Author: Stef Walter <stefw gnome org>
Date:   Thu Mar 6 11:59:48 2014 +0100

    HACKING: Update with description of how to run tests

 HACKING |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/HACKING b/HACKING
index fbffb38..7de873a 100644
--- a/HACKING
+++ b/HACKING
@@ -90,6 +90,18 @@ ui
    Prompting the user, asking for passwords.
 
 
+TESTING
+----------
+
+Significant new code should be testable via:
+
+$ make check
+
+You check for memory errors by doing:
+
+$ make check-memory
+
+
 ----------------------------------------------------------------------------------
   CODING STYLE
 ----------------------------------------------------------------------------------