使用ContentResolver运行Robolectric测试的非法连接指针

Question

我想测试一个管理数据并使用带有ContentProvider的自定义Robolectric的类。

我制作了一个包含两个测试的测试类，这些测试使用ShadowContentResolver来设置ContentProvider中的某些数据。这些测试可以完美地自己完成，但是如果我测试整个课程，则在第二堂课中会出错：

java.lang.IllegalStateException: Illegal connection pointer 1. Current pointers for thread Thread[main,5,main] []

我的测试班：

@RunWith(RobolectricTestRunner::class)
@Config(constants = BuildConfig::class, sdk = [27], manifest = "AndroidManifest.xml", application = TestApp::class)
class HomeSliderDatabaseTest {

    private lateinit var homeSliderDatabase: HomeSliderDatabase

    @Mock
    private lateinit var contentResolver: ContentResolver

    private lateinit var shadowContentResolver: ShadowContentResolver

    @Before
    fun setup() {
        contentResolver = RuntimeEnvironment.application.contentResolver
        shadowContentResolver = shadowOf(contentResolver)
        homeSliderDatabase = HomeSliderDatabase(contentResolver)
    }

    @Test
    fun determineIdsToFetch_success() {
        // put a record in the content provider
        shadowContentResolver.insert(CONTENT_URI, ContentValues().apply {
            put(ID, 1)
            put(TIMESTAMP, 1_000_000L)
        })
        val ids = homeSliderDatabase.determineIdsToFetch(mapOf(1 to 1_000L, 2 to 3_000_000L))
        assert(ids.contains(2))
        assertFalse(ids.contains(1))
    }

    @Test
    fun deleteAllHomeSliderItems_success() {
        shadowContentResolver.insert(CONTENT_URI, ContentValues().apply {
            put(ID, 2)
            put(TIMESTAMP, 1_000_000L)
        })

        val cursorBefore = shadowContentResolver.query(CONTENT_URI, null, null, null, null)
        assert(cursorBefore.count > 0)
        cursorBefore.close()

        homeSliderDatabase.removeAllHomeSliderItems()

        val cursorAfter = shadowContentResolver.query(CONTENT_URI, null, null, null, null)
        assert(cursorAfter.count == 0)
        cursorAfter.close()

    }

    @After
    fun tearDown() {

    }

}

这是完整的堆栈跟踪：

java.lang.IllegalStateException: Illegal connection pointer 1. Current pointers for thread Thread[main,5,main] []

at org.robolectric.shadows.ShadowSQLiteConnection$Connections.getConnection(ShadowSQLiteConnection.java:366)
at org.robolectric.shadows.ShadowSQLiteConnection$Connections.getStatement(ShadowSQLiteConnection.java:375)
at org.robolectric.shadows.ShadowSQLiteConnection$Connections.executeStatementOperation(ShadowSQLiteConnection.java:704)
at org.robolectric.shadows.ShadowSQLiteConnection$Connections.resetStatementAndClearBindings(ShadowSQLiteConnection.java:686)
at org.robolectric.shadows.ShadowSQLiteConnection.nativeResetStatementAndClearBindings(ShadowSQLiteConnection.java:297)
at android.database.sqlite.SQLiteConnection.nativeResetStatementAndClearBindings(SQLiteConnection.java)
at android.database.sqlite.SQLiteConnection.releasePreparedStatement(SQLiteConnection.java:916)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:520)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.__constructor__(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1546)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1417)
at my.company.contentprovider.HomeSliderContentProvider.insert(HomeSliderContentProvider.java:147)
at org.robolectric.shadows.ShadowContentResolver.insert(ShadowContentResolver.java:152)
at my.company.tests.HomeSliderDatabaseTest.determineIdsToFetch_success(HomeSliderDatabaseTest.kt:53)
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:523)
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:226)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:108)
at org.robolectric.internal.SandboxTestRunner.runChild(SandboxTestRunner.java:35)
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$1.evaluate(SandboxTestRunner.java:62)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
at com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)