tests: Add dispatch timeout tests

Add tests which verify that...

* wl_display_dispatch_timeout with a big enough timeout behaves the same
  as wl_display_dispatch
* wl_display_dispatch_timeout will time out when there are no messages
  to dispatch

Signed-off-by: Sebastian Wick <sebastian.wick@redhat.com>

tests/queue-test.c

@@ -40,6 +40,7 @@
 #include "wayland-server.h"
 #include "test-runner.h"
 #include "test-compositor.h"
+#include "../src/timespec-util.h"
 
 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
 
@@ -571,6 +572,68 @@ client_test_queue_names(void)
 	wl_display_disconnect(display);
 }
 
+static void
+dispatch_timeout_sync_callback(void *data, struct wl_callback *callback,
+			       uint32_t serial)
+{
+	bool *done = data;
+
+	*done = true;
+	wl_callback_destroy(callback);
+}
+
+static const struct wl_callback_listener dispatch_timeout_sync_listener = {
+	dispatch_timeout_sync_callback
+};
+
+static void
+client_test_queue_dispatch_simple(void)
+{
+	struct wl_display *display;
+	struct timespec timeout;
+	struct wl_callback *callback;
+	bool done = false;
+	int ret = 0;
+
+	display = wl_display_connect(NULL);
+	assert(display);
+
+	callback = wl_display_sync(display);
+	assert(callback != NULL);
+	wl_callback_add_listener(callback, &dispatch_timeout_sync_listener, &done);
+
+	timespec_from_msec(&timeout, 1000);
+
+	while (!done) {
+		ret = wl_display_dispatch_timeout(display, &timeout);
+		assert(ret > 0);
+	}
+
+	wl_display_disconnect(display);
+
+	exit(0);
+}
+
+static void
+client_test_queue_dispatch_timeout(void)
+{
+	struct wl_display *display;
+	struct timespec timeout;
+	int ret = 0;
+
+	display = wl_display_connect(NULL);
+	assert(display);
+
+	timespec_from_msec(&timeout, 100);
+
+	ret = wl_display_dispatch_timeout(display, &timeout);
+	assert(ret == 0);
+
+	wl_display_disconnect(display);
+
+	exit(0);
+}
+
 static void
 dummy_bind(struct wl_client *client,
 	   void *data, uint32_t version, uint32_t id)
@@ -709,3 +772,27 @@ TEST(queue_names)
 
 	display_destroy(d);
 }
+
+TEST(queue_dispatch_simple)
+{
+	struct display *d = display_create();
+
+	test_set_timeout(2);
+
+	client_create_noarg(d, client_test_queue_dispatch_simple);
+	display_run(d);
+
+	display_destroy(d);
+}
+
+TEST(queue_dispatch_timeout)
+{
+	struct display *d = display_create();
+
+	test_set_timeout(2);
+
+	client_create_noarg(d, client_test_queue_dispatch_timeout);
+	display_run(d);
+
+	display_destroy(d);
+}