Add MM Auth test; add auth_action_str() function
Add basic MM Authentication test setup, with fake DB access and RAND_bytes().
So far implement simple tests for IO error during DB access and missing auth
entry.
To print the auth action during tests, add struct auth_action_names and
auth_action_str() inline function in auth.[hc].
diff --git a/openbsc/tests/mm_auth/mm_auth_test.ok b/openbsc/tests/mm_auth/mm_auth_test.ok
new file mode 100644
index 0000000..5efb3de
--- /dev/null
+++ b/openbsc/tests/mm_auth/mm_auth_test.ok
@@ -0,0 +1,8 @@
+
+* test_error()
+wrapped: db_get_authinfo_for_subscr(): rc = -5
+auth_get_tuple_for_subscr(key_seq=0) --> auth_action == (internal error)
+
+* test_auth_not_avail()
+wrapped: db_get_authinfo_for_subscr(): rc = -2
+auth_get_tuple_for_subscr(key_seq=0) --> auth_action == AUTH_NOT_AVAIL