生成espresso android测试用例时出错

Question

Build.Gradle

apply plugin: 'com.android.application'
android {
    compileSdkVersion 24
    buildToolsVersion '25.0.0'
    defaultConfig {
        applicationId "com.example.project"
        minSdkVersion 18
        targetSdkVersion 24
        versionCode 27
        versionName "1.5"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            testCoverageEnabled true
        }
        debug{
            testCoverageEnabled true
        }
    }
}
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'
    })
    compile 'com.github.barteksc:android-pdf-viewer:2.0.3'
    compile 'com.google.code.gson:gson:2.8.0'
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.android.support:design:24.2.1'
    compile 'com.android.support:recyclerview-v7:24.2.1'
    compile 'com.android.support:cardview-v7:24.2.1'
    compile 'com.android.volley:volley:1.0.0'
    compile 'com.android.support:support-v4:24.2.1'
    compile 'com.google.firebase:firebase-messaging:10.0.1'
    compile 'com.google.firebase:firebase-core:10.0.1'
    compile 'com.google.firebase:firebase-crash:10.0.1'
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:support-annotations:24.2.0'
    androidTestCompile 'com.android.support.test:runner:0.2'
    androidTestCompile 'com.android.support.test:rules:0.2'
    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.0'
    androidTestCompile 'com.android.support:support-annotations:24.2.1'
    androidTestCompile('com.android.support.test.espresso:espresso-contrib:2.2') {
        exclude group: 'com.android.support', module: 'appcompat'
        exclude group: 'com.android.support', module: 'support-v4'
        exclude group: 'com.android.support', module: 'support-v7'
        exclude group: 'com.android.support', module: 'design'
        exclude module: 'support-annotations'
        exclude module: 'recyclerview-v7'



    }
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1'
    androidTestCompile "com.android.support.test.espresso:espresso-intents:2.2.2"
}

apply plugin: 'com.google.gms.google-services'
apply plugin: 'jacoco'

task jacocoTestReport(type: JacocoReport, dependsOn: ['testDebugUnitTest', 'createDebugCoverageReport']) {

    reports {
        xml.enabled = true
        html.enabled = true
    }

    def fileFilter = ['**/R.class', '**/R$*.class', '**/BuildConfig.*', '**/Manifest*.*', '**/*Test*.*', 'android/**/*.*']
    def debugTree = fileTree(dir: "${buildDir}/intermediates/classes/debug", excludes: fileFilter)
    def mainSrc = "${project.projectDir}/src/main/java"

    sourceDirectories = files([mainSrc])
    classDirectories = files([debugTree])
    executionData = fileTree(dir: "$buildDir", includes: [
            "jacoco/testDebugUnitTest.exec",
            "outputs/code-coverage/connected/*coverage.ec"
    ])
}

Answer 1

有几件事让它运转起来：

1. 请确保通过此其他线程检查所有必需项:https://stackoverflow.com/a/25525390/3195307
2. 确保已连接设备可以执行测试。仿真器、物理设备或云设备。如果在IDE中播放测试，它应该显示在“连接的设备”下的“选择部署目标”中。
3. 从项目目录运行Gradlew（项目分级包装器），如下所示：./Gradlew：app：createDebugCoverageReport