Android Espresso的空Jacoco报告

我正在尝试使用Espresso测试为我的Android项目获取代码覆盖率.然而,Jacoco正在给我一份报告说我没有报道任何事情.我做了一个演示应用程序来突出我的问题,那就是here.

如果你不想去Github查看项目,这里是build.gradle文件：

apply plugin: 'com.android.application'
apply plugin: 'jacoco'

android {
    compileSdkVersion 22
    buildToolsversion "22.0.1"

    defaultConfig {
        applicationId "ninja.bryansills.jacocotest"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"

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

    packagingOptions {
        exclude 'LICENSE.txt'
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            testCoverageEnabled true
        }
    }
}

dependencies {
    compile filetree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.1.1'

    androidTestCompile 'com.android.support.test:runner:0.2'
    androidTestCompile 'com.android.support.test:rules:0.2'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.1'
}

解决方法:

根据Ligol指出的问题,这对我有用.

在androidTest中添加了自定义测试运行器

package com.example;

import android.os.Bundle;
import android.support.test.runner.AndroidJUnitRunner;
import android.util.Log;

import java.lang.reflect.Method;

public class AndroidJacocoTestRunner extends AndroidJUnitRunner {

    static {
        System.setProperty("jacoco-agent.destfile", "/data/data/"+BuildConfig.APPLICATION_ID+"/coverage.ec");
    }

    @Override
    public void finish(int resultCode, Bundle results) {
        try {
            Class rt = Class.forName("org.jacoco.agent.rt.RT");
            Method getAgent = rt.getmethod("getAgent");
            Method dump = getAgent.getReturnType().getmethod("dump", boolean.class);
            Object agent = getAgent.invoke(null);
            dump.invoke(agent, false);
        } catch (Throwable e) {
            Log.d("JACOCO", e.getMessage());
        }
        super.finish(resultCode, results);
    }
}

在app / build.gradle中使用此测试运行器

android{
    ...
    defaultConfig {
      ....
      testInstrumentationRunner "com.example.AndroidJacocoTestRunner"
    }
}