AndroidJUnitRunner 给出 'java.lang.ClassNotFoundException' 的 Android 概率

Question

我是仪器测试的新手。我正在尝试使用 AndroidJUnitRunner 进行基本测试。这是我的毕业典礼:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 24
    buildToolsVersion "25.0.0"
    defaultConfig {
        applicationId "com.kaushik.mycart.ui"
        minSdkVersion 15
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        jackOptions.enabled true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    ..........................
    ..........................

    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:1.10.19'
    androidTestCompile 'org.hamcrest:hamcrest-library:1.3'

}

然后我添加了一个名为“ProductListActivityTest”的类来使用 AndroidJunitRunner 进行测试。如下:

package com.kaushik.myredmart.ui;
// all includes
@RunWith(AndroidJUnit4.class)
public class ProductListActivityTest {

    @Rule
    public ActivityTestRule<ProductListActivity> rule  = new  ActivityTestRule<>(ProductListActivity.class);

    @Test
    public void ensureListViewIsPresent() throws Exception {
        ProductListActivity activity = rule.getActivity();
        View viewByIdw = activity.findViewById(R.id.productListView);
        assertThat(viewByIdw,notNullValue());
        assertThat(viewByIdw, instanceOf(RecyclerView.class));
        RecyclerView productListView = (RecyclerView) viewByIdw;
        RecyclerView.Adapter adapter = productRecyclerView.getAdapter();
        assertThat(adapter, instanceOf(ProductAdapter.class));

    }
}

我没有在“androidTest”中添加其他文件。我还想提一下，我的源代码中有应用程序类文件。现在每次我尝试运行测试时，都会出现以下错误:

Started running tests
Test running failed: Instrumentation run failed due to 'java.lang.ClassNotFoundException'
Empty test suite.

谁能帮我找出测试代码中的问题？

Answer 1

您如何运行测试？

如果您是从 Android Studio 执行此操作:

• 打开运行菜单 -> 编辑配置
• 添加新的 Android 测试配置
• 选择一个模块

• 添加特定的检测运行器:

  android.support.test.runner.AndroidJUnitRunner

通过 Gradle 从命令行:

./gradlew connectedAndroidTest