import oap_client_test from osmo-sgsn

As oap_client has moved from osmo-sgsn to libosmogsm, it is only fair
that the related unit test shall also be moved here.

Change-Id: I9d64e10b4bacac9b530cf077841bad762fc6d558
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 43b58e8..a1cf98a 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -274,6 +274,13 @@
 AT_CHECK([$abs_top_builddir/tests/oap/oap_test], [0], [expout], [experr])
 AT_CLEANUP
 
+AT_SETUP([oap_client])
+AT_KEYWORDS([oap_client])
+cat $abs_srcdir/oap/oap_client_test.ok > expout
+cat $abs_srcdir/oap/oap_client_test.err > experr
+AT_CHECK([$abs_top_builddir/tests/oap/oap_client_test], [0], [expout], [experr])
+AT_CLEANUP
+
 AT_SETUP([socket])
 AT_KEYWORDS([socket])
 cat $abs_srcdir/socket/socket_test.ok > expout