1 files changed, 49 insertions, 0 deletions
diff --git a/test/interop/offline_message_queueing_test.c b/test/interop/offline_message_queueing_test.c
new file mode 100644
index 0000000..0386a47
--- /dev/null
+++ b/test/interop/offline_message_queueing_test.c
@@ -0,0 +1,49 @@
+#include "greatest.h"
+#include "testclient.h"
+#include "cleanup.c"
+#include "topics.c"
+
+TEST offline_message_queueing_test()
+{
+    TestClient *client;
+    int count;
+
+    client = TestClientNew("clienta");
+    ASSERT(TestClientConnect(client, "localhost", 1883, 60, 0));
+    ASSERT(TestClientSubscribe(client, wildtopics[5], 2));
+    TestClientDisconnect(client);
+    TestClientFree(client);
+
+    client = TestClientNew("clientb");
+    ASSERT(TestClientConnect(client, "localhost", 1883, 60, 1));
+    ASSERT(TestClientPublish(client, 0, 0, topics[1], "qos0"));
+    ASSERT(TestClientPublish(client, 1, 0, topics[2], "qos1"));
+    ASSERT(TestClientPublish(client, 2, 0, topics[3], "qos2"));
+    ASSERT(TestClientWait(client, 1000));
+    TestClientDisconnect(client);
+    TestClientFree(client);
+
+    client = TestClientNew("clienta");
+    ASSERT(TestClientConnect(client, "localhost", 1883, 60, 0));
+    ASSERT(TestClientWait(client, 2000));
+    TestClientDisconnect(client);
+    count = TestClientMessageCount(client);
+    TestClientFree(client);
+
+    ASSERT(count == 2 || count == 3);
+
+    printf("this server %s queueing QoS 0 messages for offline clients\n",
+        count == 2 ? "is not" : "is");
+
+    PASS();
+}
+
+GREATEST_MAIN_DEFS();
+
+int main(int argc, char **argv)
+{
+    GREATEST_MAIN_BEGIN();
+    cleanup();
+    RUN_TEST(offline_message_queueing_test);
+    GREATEST_MAIN_END();
+}