From 189075b950a2c7b5bd29637913d2f5ce149bfe4f Mon Sep 17 00:00:00 2001
From: Mason Chang <mchang@mozilla.com>
Date: Mon, 9 Nov 2015 19:10:26 -0800
Subject: [PATCH] Bug 1223052 - Add a gtest to test that the vsync source
 supplies a proper vsync rate. r=kats

---
 gfx/tests/gtest/TestVsync.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gfx/tests/gtest/TestVsync.cpp b/gfx/tests/gtest/TestVsync.cpp
index d50ebbd4f13d..f13afc983fa4 100644
--- a/gfx/tests/gtest/TestVsync.cpp
+++ b/gfx/tests/gtest/TestVsync.cpp
@@ -195,3 +195,12 @@ TEST_F(VsyncTester, ChildRefreshDriverGetVsyncNotifications)
   vsyncDispatcher = nullptr;
   testVsyncObserver = nullptr;
 }
+
+// Test that we can read the vsync rate
+TEST_F(VsyncTester, VsyncSourceHasVsyncRate)
+{
+  VsyncSource::Display& globalDisplay = mVsyncSource->GetGlobalDisplay();
+  TimeDuration vsyncRate = globalDisplay.GetVsyncRate();
+  ASSERT_NE(vsyncRate, TimeDuration::Forever());
+  ASSERT_GT(vsyncRate.ToMilliseconds(), 0);
+}