[Night Light] CL4: Automatic schedule backend.

ash/system/night_light/night_light_time_unittest.cc

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/system/night_light/night_light_time.h"
+
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ash {
+
+namespace {
+
+TEST(NightLightTimeTest, TestSeveralOffsets) {
+  // 6:32 PM ==> 18:32.
+  NightLightTime time1(18 * 60 + 32);
+  EXPECT_EQ("6:32 PM", time1.ToString());
+
+  // 9:59 AM.
+  NightLightTime time2(9 * 60 + 59);
+  EXPECT_EQ("9:59 AM", time2.ToString());
+
+  // Border times: 00:00 and 24:00.
+  NightLightTime time3(0);
+  NightLightTime time4(24 * 60);
+  EXPECT_EQ("12:00 AM", time3.ToString());
+  EXPECT_EQ("12:00 AM", time4.ToString());
+}
+
+TEST(NightLightTimeTest, TestFromTime) {
+  // "Now" today and "now" tomorrow should have the same minutes offset from
+  // 00:00.
+  base::Time now_today = base::Time::Now();

[James Cook, 2017/05/23 16:34:59]

Can you use a fixed time, rather than Now()?

Now + 24 hours is not the same time of day across daylight savings time.

https://memegen.googleplex.com/11477755

[afakhry, 2017/05/24 04:21:11]

Done.

+  base::Time now_tomorrow = now_today + base::TimeDelta::FromDays(1);
+  EXPECT_EQ(NightLightTime::FromTime(now_today),
+            NightLightTime::FromTime(now_tomorrow));
+}
+
+}  // namespace
+
+}  // namespace ash