没有找到类"android.support.test.runner.AndroidJUnitRunner"

Question

我正在尝试使用插桩测试，并将我的项目更新为AndroidX。但是我在尝试运行时收到以下错误：

2018-10-09 14:22:29.468 13263-13263/xxx.yyy E/AndroidRuntime: FATAL EXCEPTION: main
Process: xxx.yyy, PID: 13263
java.lang.RuntimeException: Unable to instantiate instrumentation ComponentInfo{xxx.yyy.test/android.support.test.runner.AndroidJUnitRunner}: java.lang.ClassNotFoundException: Didn't find class "android.support.test.runner.AndroidJUnitRunner" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /vendor/lib]]
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5730)
at android.app.ActivityThread.-wrap1(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.test.runner.AndroidJUnitRunner" on path: DexPathList[[],nativeLibraryDirectories=[/system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5728)
at android.app.ActivityThread.-wrap1(Unknown Source:0) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661) 
at android.os.Handler.dispatchMessage(Handler.java:105) 
at android.os.Looper.loop(Looper.java:164) 
at android.app.ActivityThread.main(ActivityThread.java:6541) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 

我的测试如下所示：

package xxx.yyy;
import android.content.Context;
import androidx.test.InstrumentationRegistry;
import androidx.test.runner.AndroidJUnit4;
import org.junit.Test;
import org.junit.runner.RunWith;
import static org.junit.Assert.*;
/**
* Instrumented test, which will execute on an Android device.
*
* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
*/
@RunWith(AndroidJUnit4.class)
public class ExampleInstrumentedTest {
@Test
public void useAppContext() {
// Context of the app under test.
Context appContext = InstrumentationRegistry.getTargetContext();
assertEquals("xxx.yyy", appContext.getPackageName());
}
}

Answer 1

在build.gradle文件中，您可以找到defaultConfig部分。使用testInstrumentationRunner属性，可以指定相应的测试运行程序。在那里，可以指定android.support包中的测试运行程序：

testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

这必须从androidx包更改为测试运行程序：

testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

Answer 2

当我忘记向 android 测试运行器添加依赖项时，我遇到了同样的问题.
所以添加这个有帮助：

androidTestImplementation("androidx.test:runner:1.2.0")

Answer 3

找不到类 "android.support.test.runner.AndroidJUnitRunner">

您迁移到了AndroidX但如您所见，您的项目中仍有android.support测试库的使用。

要解决此问题，您应该在项目中的任何位置搜索任何内容，从android.support开始并替换它或删除它以使用AndroidX库。

Answer 4

我失踪了

androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0

就我而言