OOB introduced DROP event for flow control.  This should not affect old
QMP clients.  Add a command batching check to make sure of it.
---
 tests/qmp-test.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tests/qmp-test.c b/tests/qmp-test.c
index 292c5f135a..729ec59b0a 100644
--- a/tests/qmp-test.c
+++ b/tests/qmp-test.c
@@ -78,6 +78,7 @@ static void test_qmp_protocol(void)
     QList *capabilities;
     const QListEntry *entry;
     QString *qstr;
+    int i;
 
     global_qtest = qtest_init_without_qmp_handshake(common_args);
 
@@ -135,6 +136,24 @@ static void test_qmp_protocol(void)
     g_assert_cmpint(qdict_get_int(resp, "id"), ==, 2);
     QDECREF(resp);
 
+    /*
+     * Test command batching.  In current test OOB is not enabled, we
+     * should be able to run as many commands in batch as we like.
+     * Using 16 (>8, which is OOB queue length) to make sure OOB
+     * won't break existing clients.
+     */
+    for (i = 0; i < 16; i++) {
+        qmp_async("{ 'execute': 'query-version' }");
+    }
+    /* Verify the replies to make sure no command is dropped. */
+    for (i = 0; i < 16; i++) {
+        resp = qmp_receive();
+        /* It should never be dropped.  Each of them should be a reply. */
+        g_assert(qdict_haskey(resp, "return"));
+        g_assert(!qdict_haskey(resp, "event"));
+        QDECREF(resp);
+    }
+
     qtest_end();
 }
 
-- 
2.13.5