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执行单元测试时出现以下错误。

java.lang.NoClassDefFoundError: Landroidx/room/testing/MigrationTestHelper;

    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
    at java.lang.Class.getDeclaredFields(Class.java:1916)
    at org.junit.runners.model.TestClass.getSortedDeclaredFields(TestClass.java:77)
    at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:70)
    at org.junit.runners.model.TestClass.<init>(TestClass.java:57)
    at org.junit.runners.ParentRunner.createTestClass(ParentRunner.java:88)
    at org.junit.runners.ParentRunner.<init>(ParentRunner.java:83)
    at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:65)
    at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:10)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:33)
    at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:36)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:49)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)

我的测试代码。

@RunWith(AndroidJUnit4::class)
class MigrationTest {


    private val migrations = arrayOf(
            Composition.MIGRATION_1_2, BriefComposition.MIGRATION_1_2)

    @Rule
    val helper: MigrationTestHelper = MigrationTestHelper(
            InstrumentationRegistry.getInstrumentation(),
            HomePageDatabase::class.java.canonicalName,
            FrameworkSQLiteOpenHelperFactory()
    )

    @Test
    @Throws(IOException::class)
    fun migrateAll() {
        // Create earliest version of the database.
        helper.createDatabase(HomePageDatabase.DB_NAME, 1).apply {
            close()
        }
        // Open latest version of the database. Room will validate the schema
        // once all migrations execute.
        Room.databaseBuilder(
                InstrumentationRegistry.getInstrumentation().targetContext,
                HomePageDatabase::class.java,
                HomePageDatabase.DB_NAME
        ).addMigrations(*migrations)
                .fallbackToDestructiveMigration()
                .build().apply {
                    openHelper.writableDatabase
                    close()
                }
    }
}

更重要的androidx.room:room-testing:2.2.5是添加到我的 build.gradle as androidTestImplementation，但我不知道为什么会发生这个问题

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