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diff --git a/absl/time/time_zone_test.cc b/absl/time/time_zone_test.cc
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+++ b/absl/time/time_zone_test.cc
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+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cctz/time_zone.h"
+
+#include "gtest/gtest.h"
+#include "absl/time/internal/test_util.h"
+#include "absl/time/time.h"
+
+namespace {
+
+TEST(TimeZone, ValueSemantics) {
+  absl::TimeZone tz;
+  absl::TimeZone tz2 = tz;  // Copy-construct
+  EXPECT_EQ(tz, tz2);
+  tz2 = tz;  // Copy-assign
+  EXPECT_EQ(tz, tz2);
+}
+
+TEST(TimeZone, Equality) {
+  absl::TimeZone a, b;
+  EXPECT_EQ(a, b);
+  EXPECT_EQ(a.name(), b.name());
+
+  absl::TimeZone implicit_utc;
+  absl::TimeZone explicit_utc = absl::UTCTimeZone();
+  EXPECT_EQ(implicit_utc, explicit_utc);
+  EXPECT_EQ(implicit_utc.name(), explicit_utc.name());
+
+  absl::TimeZone la = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+  absl::TimeZone nyc = absl::time_internal::LoadTimeZone("America/New_York");
+  EXPECT_NE(la, nyc);
+}
+
+TEST(TimeZone, CCTZConversion) {
+  const cctz::time_zone cz = cctz::utc_time_zone();
+  const absl::TimeZone tz(cz);
+  EXPECT_EQ(cz, cctz::time_zone(tz));
+}
+
+TEST(TimeZone, DefaultTimeZones) {
+  absl::TimeZone tz;
+  EXPECT_EQ("UTC", absl::TimeZone().name());
+  EXPECT_EQ("UTC", absl::UTCTimeZone().name());
+}
+
+TEST(TimeZone, FixedTimeZone) {
+  const absl::TimeZone tz = absl::FixedTimeZone(123);
+  const cctz::time_zone cz = cctz::fixed_time_zone(cctz::sys_seconds(123));
+  EXPECT_EQ(tz, absl::TimeZone(cz));
+}
+
+TEST(TimeZone, LocalTimeZone) {
+  const absl::TimeZone local_tz = absl::LocalTimeZone();
+  absl::TimeZone tz = absl::time_internal::LoadTimeZone("localtime");
+  EXPECT_EQ(tz, local_tz);
+}
+
+TEST(TimeZone, NamedTimeZones) {
+  absl::TimeZone nyc = absl::time_internal::LoadTimeZone("America/New_York");
+  EXPECT_EQ("America/New_York", nyc.name());
+  absl::TimeZone syd = absl::time_internal::LoadTimeZone("Australia/Sydney");
+  EXPECT_EQ("Australia/Sydney", syd.name());
+  absl::TimeZone fixed = absl::FixedTimeZone((((3 * 60) + 25) * 60) + 45);
+  EXPECT_EQ("Fixed/UTC+03:25:45", fixed.name());
+}
+
+TEST(TimeZone, Failures) {
+  absl::TimeZone tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+  EXPECT_FALSE(LoadTimeZone("Invalid/TimeZone", &tz));
+  EXPECT_EQ(absl::UTCTimeZone(), tz);  // guaranteed fallback to UTC
+
+  // Ensures that the load still fails on a subsequent attempt.
+  tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+  EXPECT_FALSE(LoadTimeZone("Invalid/TimeZone", &tz));
+  EXPECT_EQ(absl::UTCTimeZone(), tz);  // guaranteed fallback to UTC
+
+  // Loading an empty std::string timezone should fail.
+  tz = absl::time_internal::LoadTimeZone("America/Los_Angeles");
+  EXPECT_FALSE(LoadTimeZone("", &tz));
+  EXPECT_EQ(absl::UTCTimeZone(), tz);  // guaranteed fallback to UTC
+}
+
+}  // namespace