1 files changed, 44 insertions, 0 deletions
diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
index a68326caae..41f4da4e54 100644
--- a/tests/qtest/libqtest.c
+++ b/tests/qtest/libqtest.c
@@ -1418,6 +1418,50 @@ bool qtest_has_machine(const char *machine)
     return false;
 }
 
+bool qtest_has_device(const char *device)
+{
+    static QList *list;
+    const QListEntry *p;
+    QObject *qobj;
+    QString *qstr;
+    QDict *devinfo;
+    int idx;
+
+    if (!list) {
+        QDict *resp;
+        QDict *args;
+        QTestState *qts = qtest_init("-machine none");
+
+        args = qdict_new();
+        qdict_put_bool(args, "abstract", false);
+        qdict_put_str(args, "implements", "device");
+
+        resp = qtest_qmp(qts, "{'execute': 'qom-list-types', 'arguments': %p }",
+                         args);
+        g_assert(qdict_haskey(resp, "return"));
+        list = qdict_get_qlist(resp, "return");
+        qobject_ref(list);
+        qobject_unref(resp);
+
+        qtest_quit(qts);
+    }
+
+    for (p = qlist_first(list), idx = 0; p; p = qlist_next(p), idx++) {
+        devinfo = qobject_to(QDict, qlist_entry_obj(p));
+        g_assert(devinfo);
+
+        qobj = qdict_get(devinfo, "name");
+        g_assert(qobj);
+        qstr = qobject_to(QString, qobj);
+        g_assert(qstr);
+        if (g_str_equal(qstring_get_str(qstr), device)) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 /*
  * Generic hot-plugging test via the device_add QMP commands.
  */