[Night Light] CL4: Automatic schedule backend.

ash/system/night_light/time_of_day_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/time_of_day.h"
+
+#include "base/time/time.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ash {
+
+namespace {
+
+TEST(TimeOfDayTest, TestEquality) {
+  // Test created TimeOfDay objects with equal offsets are equal.
+  TimeOfDay time1(18 * 60 + 32);  // 6:32 PM.
+  TimeOfDay time2(18 * 60 + 32);  // 6:32 PM.
+  EXPECT_EQ(time1, time2);
+  TimeOfDay time3(time1);
+  EXPECT_EQ(time1, time3);
+  EXPECT_EQ(time2, time3);
+  TimeOfDay time4(9 * 60 + 59);  // 9:59 AM.
+  EXPECT_FALSE(time1 == time4);
+  time1 = time4;
+  EXPECT_EQ(time1, time4);
+}
+
+TEST(TimeOfDayTest, TestSeveralOffsets) {
+  // 6:32 PM ==> 18:32.
+  TimeOfDay time1(18 * 60 + 32);
+  EXPECT_EQ("6:32 PM", time1.ToString());

[jungshik at Google, 2017/06/05 23:17:43]

This will fail in some locales because the format is different.  e.g. it can be
'18:32" in some locales. In other locales, "PM" (location and string) can be
different, etc. 

You can use this. 

  test::ScopedRestoreICUDefaultLocale restore_locale;
  i18n::SetICUDefaultLocale("en_US");

[afakhry, 2017/06/06 00:07:17]

Done. Thanks!

+
+  // 9:59 AM.
+  TimeOfDay time2(9 * 60 + 59);
+  EXPECT_EQ("9:59 AM", time2.ToString());
+
+  // Border times: 00:00 and 24:00.
+  TimeOfDay time3(0);
+  TimeOfDay time4(24 * 60);
+  EXPECT_EQ("12:00 AM", time3.ToString());
+  EXPECT_EQ("12:00 AM", time4.ToString());
+}
+
+TEST(TimeOfDayTest, TestFromTime) {
+  // "Now" today and "now" tomorrow should have the same minutes offset from
+  // 00:00.
+  // Assume that "now" is Tuesday May 23, 2017 at 10:30 AM.
+  base::Time::Exploded now;
+  now.year = 2017;
+  now.month = 5;        // May.
+  now.day_of_week = 2;  // Tuesday.
+  now.day_of_month = 23;
+  now.hour = 10;
+  now.minute = 30;
+  now.second = 0;
+  now.millisecond = 0;
+
+  base::Time now_today = base::Time::Now();
+  ASSERT_TRUE(base::Time::FromLocalExploded(now, &now_today));
+  base::Time now_tomorrow = now_today + base::TimeDelta::FromDays(1);
+  EXPECT_EQ(TimeOfDay::FromTime(now_today), TimeOfDay::FromTime(now_tomorrow));
+}
+
+}  // namespace
+
+}  // namespace ash