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diff --git a/absl/time/clock_test.cc b/absl/time/clock_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 "absl/time/clock.h"
+
+#include "absl/base/config.h"
+#if defined(ABSL_HAVE_ALARM)
+#include <signal.h>
+#include <unistd.h>
+#elif defined(__linux__) || defined(__APPLE__)
+#error all known Linux and Apple targets have alarm
+#endif
+
+#include "gtest/gtest.h"
+#include "absl/time/time.h"
+
+namespace {
+
+TEST(Time, Now) {
+  const absl::Time before = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+  const absl::Time now = absl::Now();
+  const absl::Time after = absl::FromUnixNanos(absl::GetCurrentTimeNanos());
+  EXPECT_GE(now, before);
+  EXPECT_GE(after, now);
+}
+
+TEST(SleepForTest, BasicSanity) {
+  absl::Duration sleep_time = absl::Milliseconds(2500);
+  absl::Time start = absl::Now();
+  absl::SleepFor(sleep_time);
+  absl::Time end = absl::Now();
+  EXPECT_LE(sleep_time - absl::Milliseconds(100), end - start);
+  EXPECT_GE(sleep_time + absl::Milliseconds(100), end - start);
+}
+
+#ifdef ABSL_HAVE_ALARM
+// Helper for test SleepFor.
+bool alarm_handler_invoked = false;
+void AlarmHandler(int signo) {
+  ASSERT_EQ(signo, SIGALRM);
+  alarm_handler_invoked = true;
+}
+
+TEST(SleepForTest, AlarmSupport) {
+  alarm_handler_invoked = false;
+  sig_t old_alarm = signal(SIGALRM, AlarmHandler);
+  alarm(2);
+  absl::Duration sleep_time = absl::Milliseconds(3500);
+  absl::Time start = absl::Now();
+  absl::SleepFor(sleep_time);
+  absl::Time end = absl::Now();
+  EXPECT_TRUE(alarm_handler_invoked);
+  EXPECT_LE(sleep_time - absl::Milliseconds(100), end - start);
+  EXPECT_GE(sleep_time + absl::Milliseconds(100), end - start);
+  signal(SIGALRM, old_alarm);
+}
+#endif  // ABSL_HAVE_ALARM
+
+}  // namespace