added test

Author: Alexandru Scvortov

src/rabbit_tests.erl

@@ -675,6 +675,14 @@ test_cluster_management2(SecondaryNode) ->
     %% join non-existing cluster as a ram node
     ok = control_action(force_cluster, ["invalid1@invalid",
                                         "invalid2@invalid"]),
+    ok = control_action(start_app, []),
+    ok = control_action(stop_app, []),
+
+    %% join empty cluster as a ram node
+    ok = control_action(cluster, []),
+    ok = control_action(start_app, []),
+    ok = control_action(stop_app, []),
+
     %% turn ram node into disk node
     ok = control_action(reset, []),
     ok = control_action(cluster, [SecondaryNodeS, NodeS]),