pam: Add some tests for the PAM module

These require you to install some pam configs into /etc/pam.d. You
can do it with the following commands:

$ make enable-pam-tests
$ make disable-pam-tests

1 files changed, 6 insertions, 0 deletions

diff --git a/HACKING b/HACKING
index 7de873ad..fa14a172 100644
--- a/HACKING
+++ b/HACKING
@@ -101,6 +101,12 @@ You check for memory errors by doing:
 
 $ make check-memory
 
+To test the pam code, you must first place some custom PAM configuration
+in your /etc/pam.d. This will not be used by anything else. To do this:
+
+$ sudo make enable-pam-tests
+$ sudo make disable-pam-tests
+
 
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