Robolectric未找到测试

Question

我在android studio里开始使用robolectric。我会运行一个简单的例子，但是我有这个错误

运行测试测试运行已启动的junit.framework.AssertionFailedError:在android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176) at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555) at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1837)的com.example.myApp.AuthenticationActivityTest中找不到测试

测试类

@RunWith(RobolectricTestRunner.class)
public class AuthenticationActivityTest {

@Test
public void checkAccountType() throws Exception{
    String accType = new AuthenticationActivity().getResources().getString(R.string.account_type);
    assertThat(accType,equalTo("com.example.myApp"));
}
}

Gradle文件

apply plugin: 'com.android.application'
apply plugin: 'org.robolectric' //Robolectric

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.example.myApp"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            debuggable true
        }
    }
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'LICENSE.txt'
    }
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
    androidTestCompile 'junit:junit:4.12' //Robolectric
    androidTestCompile 'org.robolectric:robolectric:2.4' //Robolectric
}

更新

当我在gradle的默认配置中添加testInstrumentationRunner时：

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

robolectic测试变得可识别，但我得到了这个错误：

com.example.myApp.AuthenticationActivityTest > testAccountType[small(AVD) - 5.0.2] FAILED 
java.lang.NullPointerException: parentLoader == null && !nullAllowed
at java.lang.ClassLoader.<init>(ClassLoader.java:210)
:app:connectedAndroidTest FAILED

Answer 1

尝试添加；

sourceSets {
    androidTest {
        setRoot('src/test')
    }
}

到你的build.gradle 'android‘闭包，指向你的测试目录。

另外，你是不是直接从Android Studio运行测试？我之前遇到过这样的问题，试着从终端使用gradle test命令运行它们。