diff --git a/tests/qtest/libqos/libqtest.h b/tests/qtest/libqos/libqtest.h
index dff6b31cf0..a6d38d7ef7 100644
--- a/tests/qtest/libqos/libqtest.h
+++ b/tests/qtest/libqos/libqtest.h
@@ -744,6 +744,16 @@ void qtest_qmp_device_add_qdict(QTestState *qts, const char *drv,
 void qtest_qmp_device_add(QTestState *qts, const char *driver, const char *id,
                           const char *fmt, ...) GCC_FMT_ATTR(4, 5);
 
+/**
+ * qtest_qmp_add_client:
+ * @qts: QTestState instance to operate on
+ * @protocol: the protocol to add to
+ * @fd: the client file-descriptor
+ *
+ * Call QMP ``getfd`` followed by ``add_client`` with the given @fd.
+ */
+void qtest_qmp_add_client(QTestState *qts, const char *protocol, int fd);
+
 /**
  * qtest_qmp_device_del:
  * @qts: QTestState instance to operate on
diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index 65ed949685..a68326caae 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -1453,6 +1453,25 @@ void qtest_qmp_device_add(QTestState *qts, const char *driver, const char *id,
     qobject_unref(args);
 }
 
+void qtest_qmp_add_client(QTestState *qts, const char *protocol, int fd)
+{
+    QDict *resp;
+
+    resp = qtest_qmp_fds(qts, &fd, 1, "{'execute': 'getfd',"
+                         "'arguments': {'fdname': 'fdname'}}");
+    g_assert(resp);
+    g_assert(!qdict_haskey(resp, "event")); /* We don't expect any events */
+    g_assert(!qdict_haskey(resp, "error"));
+    qobject_unref(resp);
+
+    resp = qtest_qmp(
+        qts, "{'execute': 'add_client',"
+        "'arguments': {'protocol': %s, 'fdname': 'fdname'}}", protocol);
+    g_assert(resp);
+    g_assert(!qdict_haskey(resp, "event")); /* We don't expect any events */
+    g_assert(!qdict_haskey(resp, "error"));
+    qobject_unref(resp);
+}
 
 /*
  * Generic hot-unplugging test via the device_del QMP command.