在测试用例浓缩咖啡之前清除数据库

Question

我正在使用浓缩咖啡清除我应用程序中的数据库我这样设置 activity

@Rule
@JvmField
val activity = ActivityTestRule<PhotoPrinterActivity>(PhotoPrinterActivity::class.java,false,false)

这是我之前的功能

@Before
open fun setup() {
    clearDatabase()
    activity.launchActivity(null)
    // Waiting for start app success fully

}

这是我清除数据库的代码

fun clearDatabase() {
    val databaseList = InstrumentationRegistry.getInstrumentation().targetContext.databaseList()
    for (database in databaseList) {

        // when transaction rollback files exists they are always locked so we can't delete them
        if (database.contains(".db-journal")) {
            InstrumentationRegistry.getTargetContext().deleteDatabase(database)
            continue
        }

        // when using transaction write ahead logging then this db files are listed but often they don't exist
        if (database.contains(".db-wal") || database.contains(".db-shm")) {
            InstrumentationRegistry.getTargetContext().deleteDatabase(database)
            continue
        }
        Log.v("EspressoMacchiato", "deleting " + database)
        var databasePath = InstrumentationRegistry.getInstrumentation().targetContext.getDatabasePath(database)
        if (databasePath.exists()) {
            InstrumentationRegistry.getInstrumentation().targetContext.deleteDatabase(database)
        }
    }

}

问题是当清除数据库成功并执行将一些数据添加到数据库时，

android.database.sqlite.SQLiteReadOnlyDatabaseException: attempt to write a readonly database (code 1032)
at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:786)
at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)

任何人都请帮助我！非常感谢！

Answer 1

在您的浓缩咖啡测试中使用 @BeforeClass and InstrumentationRegistry 删除数据库：

@BeforeClass
public static void beforeClass() {
    InstrumentationRegistry.getTargetContext().deleteDatabase("database_name");
}

为了防止一次执行多个浓缩咖啡测试时出现错误，请使用 Android Test Orchestrator。它将单独执行所有这些。

Answer 2

每次测试清除一次数据库class

将以下代码添加到您的 Android 测试 class:

companion object {
    @BeforeClass
    fun clearDatabase() {
        InstrumentationRegistry.getInstrumentation().uiAutomation.executeShellCommand("pm clear PACKAGE_NAME").close()
    }
}

每次测试前清空数据库

在每次测试运行之前清除数据库的另一种方法是在使用 Android Test Orchestrator 时设置 clearPackageData 标志。这将“在每次测试后从设备的 CPU 和内存中删除所有共享状态：”

Add the following statements to your project's build.gradle file:

android {
  defaultConfig {
   ...
   testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

   // The following argument makes the Android Test Orchestrator run its
   // "pm clear" command after each test invocation. This command ensures
   // that the app's state is completely cleared between tests.
   testInstrumentationRunnerArguments clearPackageData: 'true'
 }

  testOptions {
    execution 'ANDROIDX_TEST_ORCHESTRATOR'
  }
}

dependencies {
  androidTestImplementation 'androidx.test:runner:1.1.0'
  androidTestUtil 'androidx.test:orchestrator:1.1.0'
}

Answer 3

如果您因弃用而无法使已接受的答案起作用，我相信 Instrumentation api 已更新为： InstrumentationRegistry .getInstrumentation() .getTargetContext()

因此：

InstrumentationRegistry.getInstrumentation().getTargetContext().deleteDatabase("database_name")

或者，您可以获得实际的应用程序上下文（“目标”），您可以这样做：

ApplicationProvider.getApplicationContext<YOUR-APPLICATION>().deleteDatabase("database_name")

在测试用例浓缩咖啡之前清除数据库

Clear database before testcase espresso

android

ui-automation

kotlin

android-espresso

每次测试清除一次数据库class

每次测试前清空数据库