当在Robolectric @config中指定清单路径时，会抛出空指针异常。

Question

我第一次尝试使用Robolectric进行工作。

我阅读了许多互联网上的文档，并准备了以下测试代码开始。在编写代码时，我利用了以下资源 =>

https://github.com/codepath/android_guides/wiki/Robolectric-Installation-for-Unit-Testing

https://github.com/codepath/android_guides/wiki/Android-Unit-and-Integration-testing

http://www.vogella.com/tutorials/Robolectric/article.html

@RunWith( RobolectricTestRunner.class )
@Config( constants = BuildConfig.class, sdk = 21, manifest = "src/main/AndroidManifest.xml" )
public class RemovePeriodTest {

    @Before
    public void setUp() throws Exception {

    }

    @Test
    public void testCheckRemoveButtonControl() throws Exception {
        daySettingsActivity = Robolectric.buildActivity(     DaySettingsActivity.class ).create().get();
        ListView l = ( ListView ) daySettingsActivity.findViewById( R.id.settings_page );
        assertNotNull( "test", l );
    }


    @After
    public void tearDown() throws Exception {


    }
}

它抛出以下错误。

java.lang.NullPointerException
    at org.robolectric.manifest.MetaData.init(MetaData.java:55)
    at org.robolectric.manifest.AndroidManifest.initMetaData(AndroidManifest.java:343)
    at org.robolectric.res.builder.DefaultPackageManager.addManifest(DefaultPackageManager.java:417)
    at org.robolectric.internal.ParallelUniverse.setUpApplicationState(ParallelUniverse.java:74)
    at org.robolectric.RobolectricTestRunner.setUpApplicationState(RobolectricTestRunner.java:433)
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:240)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:188)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:152)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

java.lang.RuntimeException: java.lang.NullPointerException
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:244)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:188)
    at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:54)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:152)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.lang.NullPointerException
    at org.robolectric.manifest.MetaData.init(MetaData.java:55)
    at org.robolectric.manifest.AndroidManifest.initMetaData(AndroidManifest.java:343)
    at org.robolectric.res.builder.DefaultPackageManager.addManifest(DefaultPackageManager.java:417)
    at org.robolectric.internal.ParallelUniverse.setUpApplicationState(ParallelUniverse.java:74)
    at org.robolectric.RobolectricTestRunner.setUpApplicationState(RobolectricTestRunner.java:433)
    at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:240)
    ... 18 more

由于我无法指定清单文件，它看起来像下面这样，因此会抛出此错误 =>

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

当未指定清单路径时，这是出现的代码。

@RunWith( RobolectricTestRunner.class )
@Config( constants = BuildConfig.class, sdk = 18, manifest = Config.NONE )
public class RemovePeriodTest {

- Olkunmustafa

Answer 1

以下是我们设置测试的步骤：

@RunWith(RobolectricGradleTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class TrackerFragmentViewTest {
}

注意不同的运行器以及没有清单规范。

- Eugen Martynov