unit test for system clock.

diff --git a/support/general/src/test/java/org/wamblee/general/SystemClockTest.java b/support/general/src/test/java/org/wamblee/general/SystemClockTest.java
new file mode 100644 (file)
index 0000000..e27b6a5
--- /dev/null
+++ b/support/general/src/test/java/org/wamblee/general/SystemClockTest.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2005-2010 the original author or 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.
+ */
+package org.wamblee.general;
+
+import static junit.framework.Assert.*;
+
+import org.junit.Test;
+
+public class SystemClockTest {
+
+    private static final long EPS = 1000;
+
+    @Test
+    public void testClock() {
+        Clock clock = new SystemClock();
+        for (int i = 0; i < 10; i++) {
+            long time = System.currentTimeMillis();
+            long time2 = clock.currentTimeMillis();
+            assertTrue(Math.abs(time2 - time) < EPS);
+        }
+    }
+}