oap: add OAP API test

Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/oap/oap_test.ok b/openbsc/tests/oap/oap_test.ok
index e411ad9..2e9ecf0 100644
--- a/openbsc/tests/oap/oap_test.ok
+++ b/openbsc/tests/oap/oap_test.ok
@@ -1,2 +1,7 @@
-not implemented
+Testing OAP API
+  - Config parsing
+  - AUTN failures
+  - AUTN success
+  - Registration failure
+  - Registration success
 Done