diff --git a/app/src/test/java/test/shangyu/cn/myapplication/ExampleUnitTest.java b/app/src/test/java/test/shangyu/cn/myapplication/ExampleUnitTest.java
new file mode 100644
index 0000000..2f848e6
--- /dev/null
+++ b/app/src/test/java/test/shangyu/cn/myapplication/ExampleUnitTest.java
@@ -0,0 +1,17 @@
+package test.shangyu.cn.myapplication;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}
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