1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/util/JavaClockTest.java b/src/test/java/com/google/devtools/build/lib/util/JavaClockTest.java
new file mode 100644
index 0000000000..d5d39c0fc2
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/lib/util/JavaClockTest.java
@@ -0,0 +1,39 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.
+package com.google.devtools.build.lib.util;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/**
+ * Tests for the Clock instance based on the Java System class.
+ */
+@RunWith(JUnit4.class)
+public class JavaClockTest {
+
+  @Test
+  public void javaClockIsAdvancing() throws Exception {
+    Clock clock = new JavaClock();
+    long millis = clock.currentTimeMillis();
+    long nanos = clock.nanoTime();
+
+    Thread.sleep(10);
+
+    assertThat(clock.currentTimeMillis()).isNotEqualTo(millis);
+    assertThat(clock.nanoTime()).isNotEqualTo(nanos);
+  }
+}