使用Robolectric的ContentProvider測試

我創建了一個自定義的ContentProvider，它由Sqlite查詢，更新，插入等實現。在我的代碼中，我使用這個ContentProvider來存儲我的數據。現在我想用Robolectric來測試我的應用程序。但測試代碼如下失敗，使用Robolectric的ContentProvider測試

java.lang.NullPointerException 
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:223) 
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163) 
at com.podcast.rick.database.PodcastProvider.query(PodcastProvider.java:61) 
at org.robolectric.shadows.ShadowContentResolver.query(ShadowContentResolver.java:157) 
at android.content.ContentResolver.query(ContentResolver.java) 
at com.podcast.rick.rpodcast.RssReaderTest.parseRSS(RssReaderTest.java:61) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
at org.robolectric.RobolectricTestRunner$HelperTestRunner$1.evaluate(RobolectricTestRunner.java:487) 
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) 
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) 
at org.robolectric.internal.SandboxTestRunner$2.evaluate(SandboxTestRunner.java:209) 
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:109) 
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:36) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.robolectric.internal.SandboxTestRunner$1.evaluate(SandboxTestRunner.java:63) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:119) 
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) 
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234) 
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74) 
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

可以看出，第一個叫Robolectric影子類，

at org.robolectric.shadows.ShadowContentResolver.query(ShadowContentResolver.java:157) 
at android.content.ContentResolver.query(ContentResolver.java)

而是叫最後的Android代碼，

android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:223) 
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)

我想在Robolectric單元測試中，影子類應該用來代替Android框架代碼，但是這裏爲什麼android.database.sqlite.SQLiteOpenHelper會調用？

我的設置方法如下，

@Before 
public void setUp() throws Exception { 
    PodcastProvider provider = new PodcastProvider(); 
    provider.onCreate(); 
    Robolectric.setupContentProvider(PodcastProvider.class); 
    ShadowContentResolver.registerProviderInternal("com.rick.podcast", provider); 
}

什麼錯或遺漏什麼嗎？我使用Robolectric 3.3.1。

感謝。

來源

2017-04-05 RickSu

請把日誌在一個灰色的代碼塊了。 – greenapps

請先評論一下這個例外。 – greenapps

確保您已註解測試類

@RunWith(RobolectricTestRunner.class) 
@Config(manifest = Config.NONE) 
public class YourTestClass { ...

來源

2017-06-25 19:19:51 Youness

使用Robolectric的ContentProvider測試

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