Robolectric实践，但是还不稳定

教程网上比较多，但是因为最新版是3.0了，所以用上面的官网robolectric资料还是比较好，配置比较简单，基本是在gradle里加上依赖，再在build variants里把artifact改为junit就可以开始写擦了。

testCompile 'junit:junit:4.12'
testCompile "org.robolectric:robolectric:3.0"

本来打算要做项目中使用，中间了遇到了几个问题，当然如果你只是用官方的demo去实验，好像一切都很完美。

试过demo，我也是觉得这个框架很强大，运行很快，不需要连接手机，但是我接入之前写的一个app时就遇到问题了，首先遇到一个warn加exception
WARNING: No manifest file found at ./AndroidManifest.xml.Falling back to the Android OS resources only.
To remove this warning, annotate your test class with @Config(manifest=Config.NONE).
android.content.res.Resources$NotFoundException: Unable to find resource ID #0x7f03001b
at org.robolectric.shadows.ShadowResources.checkResName(ShadowResources.java:343)
at org.robolectric.shadows.ShadowResources.resolveResName(ShadowResources.java:338)
at org.robolectric.shadows.ShadowResources.loadXmlResourceParser(ShadowResources.java:429)
at android.content.res.Resources.loadXmlResourceParser(Resources.java)

这个可以通过在Config里配置manifest路径解决。
然后是初始化时自定义的application里异常，因为我在application里进行了一些初始化，比如sd卡目录什么的，导致直接运行失败，后来用框架提供的shadow，然后在Config里配置application为自定义的就可以了。

@Implements(AssistApplication.class)
public class ShadowApplication extends Application{
@Implementation
public static void initDownloader(){}
}

之后想测试一下toast测试

@RunWith(RobolectricTestRunner.class)

@Config(constants = BuildConfig.class,

manifest = "src/main/AndroidManifest.xml",

application = ShadowApplication.class,

shadows = {ShadowApplication.class},

sdk = 19)

public class AssistActivityTest {

@Before

public void setUp(){

}

@Test

public void testAssist(){

ProxyActivity activity = Robolectric.setupActivity(ProxyActivity.class);

View view = activity.findViewById(R.id.id_layout_proxy_switch);
view.performClick();

ShadowLooper.idleMainLooper();

assertEquals(ShadowToast.getLatestToast(),"请设置ip地址");

}

}

遇到了如下异常，去github上看了[issues](https://github.com/robolectric/robolectric/labels/defect?page=2&q=is%3Aopen+label%3Adefect)还是有很多问题没解决，所以暂时还是打算不在项目中使用了。

java.lang.NullPointerException
at org.robolectric.shadows.ShadowAssetManager$OverlayedStyle.equals(ShadowAssetManager.java:318)
at org.robolectric.shadows.ShadowAssetManager.applyThemeStyle(ShadowAssetManager.java:291)
at org.robolectric.shadows.ShadowResources$ShadowTheme.applyStyle(ShadowResources.java:461)
at android.content.res.Resources$Theme.applyStyle(Resources.java)
at android.view.ContextThemeWrapper.onApplyThemeResource(ContextThemeWrapper.java:132)
at android.app.Activity.onApplyThemeResource(Activity.java:3360)
at android.view.ContextThemeWrapper.initializeTheme(ContextThemeWrapper.java:144)
at android.view.ContextThemeWrapper.setTheme(ContextThemeWrapper.java:89)
at org.robolectric.shadows.ShadowActivity.setThemeFromManifest(ShadowActivity.java:85)
at org.robolectric.shadows.CoreShadowsAdapter$1.setThemeFromManifest(CoreShadowsAdapter.java:35)
at org.robolectric.util.ActivityController.attach(ActivityController.java:58)
at org.robolectric.util.ActivityController$1.run(ActivityController.java:121)