1 files changed, 78 insertions, 0 deletions
diff --git a/tests/unit/check-qnull.c b/tests/unit/check-qnull.c
new file mode 100644
index 0000000000..ebf21db83c
--- /dev/null
+++ b/tests/unit/check-qnull.c
@@ -0,0 +1,78 @@
+/*
+ * QNull unit-tests.
+ *
+ * Copyright (C) 2016 Red Hat Inc.
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+#include "qemu/osdep.h"
+
+#include "qapi/qmp/qnull.h"
+#include "qemu-common.h"
+#include "qapi/qobject-input-visitor.h"
+#include "qapi/qobject-output-visitor.h"
+#include "qapi/error.h"
+
+/*
+ * Public Interface test-cases
+ *
+ * (with some violations to access 'private' data)
+ */
+
+static void qnull_ref_test(void)
+{
+    QObject *obj;
+
+    g_assert(qnull_.base.refcnt == 1);
+    obj = QOBJECT(qnull());
+    g_assert(obj);
+    g_assert(obj == QOBJECT(&qnull_));
+    g_assert(qnull_.base.refcnt == 2);
+    g_assert(qobject_type(obj) == QTYPE_QNULL);
+    qobject_unref(obj);
+    g_assert(qnull_.base.refcnt == 1);
+}
+
+static void qnull_visit_test(void)
+{
+    QObject *obj;
+    Visitor *v;
+    QNull *null;
+
+    /*
+     * Most tests of interactions between QObject and visitors are in
+     * test-qmp-*-visitor; but these tests live here because they
+     * depend on layering violations to check qnull_ refcnt.
+     */
+
+    g_assert(qnull_.base.refcnt == 1);
+    obj = QOBJECT(qnull());
+    v = qobject_input_visitor_new(obj);
+    qobject_unref(obj);
+    visit_type_null(v, NULL, &null, &error_abort);
+    g_assert(obj == QOBJECT(&qnull_));
+    qobject_unref(null);
+    visit_free(v);
+
+    null = NULL;
+    v = qobject_output_visitor_new(&obj);
+    visit_type_null(v, NULL, &null, &error_abort);
+    visit_complete(v, &obj);
+    g_assert(obj == QOBJECT(&qnull_));
+    qobject_unref(null);
+    qobject_unref(obj);
+    visit_free(v);
+
+    g_assert(qnull_.base.refcnt == 1);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    g_test_add_func("/public/qnull_ref", qnull_ref_test);
+    g_test_add_func("/public/qnull_visit", qnull_visit_test);
+
+    return g_test_run();
+}