Add base::TimeDelta::Max().

TimeDelta::Max() is a maximum timedelta, larger than any timedelta you
can compare it to. The results of adding it to a time, or another time
delta are undefined.

R=ajwong@chromium.org,mkwst@chromium.org,jar@chromium.org
TBR=jamesr@chomium.org,acolwell@chromium.org,nick@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/163413004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253502 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 40 insertions, 0 deletions

diff --git a/base/time/time_unittest.cc b/base/time/time_unittest.cc
index b5d2493..40d7bd4 100644
--- a/base/time/time_unittest.cc
+++ b/base/time/time_unittest.cc
@@ -481,6 +481,46 @@ TEST_F(TimeTest, ExplodeBeforeUnixEpoch) {
   EXPECT_EQ(1, exploded.millisecond);
 }
 
+TEST_F(TimeTest, TimeDeltaMax) {
+  TimeDelta max = TimeDelta::Max();
+  EXPECT_TRUE(max.is_max());
+  EXPECT_EQ(max, TimeDelta::Max());
+  EXPECT_GT(max, TimeDelta::FromDays(100 * 365));
+  EXPECT_GT(max, TimeDelta());
+}
+
+TEST_F(TimeTest, TimeDeltaMaxConversions) {
+  TimeDelta t = TimeDelta::Max();
+  EXPECT_EQ(std::numeric_limits<int64>::max(), t.ToInternalValue());
+
+  EXPECT_EQ(std::numeric_limits<int>::max(), t.InDays());
+  EXPECT_EQ(std::numeric_limits<int>::max(), t.InHours());
+  EXPECT_EQ(std::numeric_limits<int>::max(), t.InMinutes());
+  EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InSecondsF());
+  EXPECT_EQ(std::numeric_limits<int64>::max(), t.InSeconds());
+  EXPECT_EQ(std::numeric_limits<double>::infinity(), t.InMillisecondsF());
+  EXPECT_EQ(std::numeric_limits<int64>::max(), t.InMilliseconds());
+  EXPECT_EQ(std::numeric_limits<int64>::max(), t.InMillisecondsRoundedUp());
+
+  t = TimeDelta::FromDays(std::numeric_limits<int>::max());
+  EXPECT_TRUE(t.is_max());
+
+  t = TimeDelta::FromHours(std::numeric_limits<int>::max());
+  EXPECT_TRUE(t.is_max());
+
+  t = TimeDelta::FromMinutes(std::numeric_limits<int>::max());
+  EXPECT_TRUE(t.is_max());
+
+  t = TimeDelta::FromSeconds(std::numeric_limits<int64>::max());
+  EXPECT_TRUE(t.is_max());
+
+  t = TimeDelta::FromMilliseconds(std::numeric_limits<int64>::max());
+  EXPECT_TRUE(t.is_max());
+
+  t = TimeDelta::FromMicroseconds(std::numeric_limits<int64>::max());
+  EXPECT_TRUE(t.is_max());
+}
+
 TEST_F(TimeTest, Max) {
   Time max = Time::Max();
   EXPECT_TRUE(max.is_max());