Android Studio 进行单元测试完整教程

Android Studio更新到2.0以后，在build variants窗口下没有 test artifact选项，无法选择是Android Instrumentation Tests还是Unit Tests，如下图。

Google一下，解决方案是依次打开： File Menu -> Settings -> Build, Execution, Deployment -> Build Tools -> Gradle -> Experimental，

将Enable all test artifacts (Unit Test and Instrumentation Test) in Android projects取消勾选，之后我们熟悉的Test Artifact就出现了，如下图

编写测试用例步骤

以下以一个由AndroidStudio一步步创建的全新工程为例

在src目录下会包含三个目录：

 
- androidTest.java.[包名] 
main.java.[包名] 
test.java.[包名] 
- mian目录下为项目代码，androidTest目录下为编写Android测试用例使用，test目录下未编写Java测试用例使用。

gradle文件

• 增加testCompile 'junit:junit:4.12' 用于Java编写执行Java测试用例。

编写Java测试用例

<code class="hljs java has-numbering" style="display: block; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; "><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">import</span> org.junit.Test;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">import</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">static</span> org.junit.Assert.*;<span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box; ">/** * To work on unit tests, switch the Test Artifact in the Build Variants view. */</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">public</span> <span class="hljs-class" style="box-sizing: border-box; "><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102); ">ExampleUnitTest</span> {</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">final</span> String TAG = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box; ">"ExampleUnitTest"</span>;    <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box; ">@Test</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">void</span> <span class="hljs-title" style="box-sizing: border-box; ">addition_isCorrect</span>() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">throws</span> Exception {        assertEquals(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box; ">4</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box; ">2</span> + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box; ">2</span>);    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 6px; padding-right: 0px; padding-bottom: 40px; padding-left: 0px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style-type: none; list-style-position: initial; list-style-image: initial; text-align: right; "><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">1</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">2</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">3</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">4</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">5</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">6</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">7</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">8</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">9</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">10</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">11</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">12</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">13</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">14</li></ul>

测试用例的执行才是最关键的点

• 打开测试用例类，即上面的ExampleUnitTest
• 在AndroidStudio的界面做侧边栏下部，有两个工具栏（Build Variants 和 Favorites）
• 点击 Build Variants，Test Artifact 选项框选择Unit Tests（同理跑Android测试用例选择Android Instrumentation Tests）
• 在AndroidStudio的界面做侧边栏上部有一个structure工具标签，（如果找不到，可以通过 工具栏–View–Tool Windows–Structure 打开此工具标签），打开此标签就可以看到此测试用例类的所有方法
• 鼠标选中要测的方法，右键–Run [方法名]，即可进行Java用例测试。

编写Android测试用例

我在androidTest.java.[包名]文件夹中添加了一个类TestAndroidClass，该类派生自InstrumentationTestCase，并写了一个方法，完整代码如下：

<code class="hljs java has-numbering" style="display: block; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; background-image: initial; background-attachment: initial; background-origin: initial; background-clip: initial; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; "><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">import</span> android.test.InstrumentationTestCase;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">public</span> <span class="hljs-class" style="box-sizing: border-box; "><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102); ">TestAndroidClass</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102); ">InstrumentationTestCase</span> {</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">final</span> String TAG = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box; ">"TestAndroidClass"</span>;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">void</span> <span class="hljs-title" style="box-sizing: border-box; ">test</span>() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box; ">throws</span> Exception{        assertEquals(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box; ">2</span>, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box; ">2</span>);    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 6px; padding-right: 0px; padding-bottom: 40px; padding-left: 0px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style-type: none; list-style-position: initial; list-style-image: initial; text-align: right; "><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">1</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">2</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">3</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">4</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">5</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">6</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">7</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">8</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">9</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">10</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">11</li><li style="box-sizing: border-box; padding-top: 0px; padding-right: 5px; padding-bottom: 0px; padding-left: 5px; ">12</li></ul>

• 测试用例执行方法同Java测试用例，但是 Build Variants 的 Test Artifact 选项框一定要更改为 Android Instrumentation Tests。
• 注意事项，在android studio中，所有的测试代码必须以test-作为前缀，不然android studio无法识别它为测试代码。（以test为前缀的方法是高亮的，非test的前缀则不是，通过这一点也可以证明）

最后的话： 
Build Variants的选择很重要，如果选择Unit Tests，Android的测试用例就会不被识别，反之Java的测试用例不被识别，所以在跑测试用例时一定选对标签。

文章部分内容的编写参考了这个博客 
官方测试用例教程在这里

本文转载自http://blog.csdn.net/pdskyzcc1/article/details/50953083
http://blog.csdn.net/wutongyu0123wutongyu/article/details/51898642