Android Studio Error JUNIT4 !!! 预期JUnit版本3.8或更高版本:

我正在做Android项目(在Android Studio中),里面有一个纯Java的小SDK.

所以我想要的是从JUnit4进行测试.

我以这种方式配置了Gradlle文件:

apply plugin: 'android'

android {
    compileSdkVersion "Google Inc.:Google APIs:19"
    buildToolsVersion "19.0.1"

    lintOptions{
        checkReleaseBuilds false
    }

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
        versionCode 28
        versionName "4.0.5"
    }

    signingConfigs {
        debug {
        }

        release {
        }

    }

    buildTypes {

        debug{
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
            debuggable true
            buildConfigField "boolean", "LOG_ENABLED", "true"
            signingConfig signingConfigs.debug
        }

        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
            debuggable false
            buildConfigField "boolean", "LOG_ENABLED", "false"
            signingConfig signingConfigs.release
        }
    }

    productFlavors{
        develFlavor{
        }

        testFlavor{
        }

        trainingFlavor{
        }

        preFlavor{
        }

        proFlavor{

        }
    }

}

if (project.hasProperty('storePassword')) {
    android.signingConfigs.release.storePassword = storePassword
}

if (project.hasProperty('keyAlias')) {
    android.signingConfigs.release.keyAlias = keyAlias
}

if (project.hasProperty('keyPassword')) {
    android.signingConfigs.release.keyPassword = keyPassword
}

//testing
sourceSets {
    unitTest {
        java.srcDir file('test')
        resources.srcDir file('test/resources')
    }
}

configurations {
    unitTestCompile.extendsFrom runtime
    unitTestRuntime.extendsFrom unitTestCompile
}

task unitTest(type:Test, dependsOn: assemble) {
    description = "run unit tests"
    testClassesDir = project.sourceSets.unitTest.output.classesDir
    classpath = project.sourceSets.unitTest.runtimeClasspath
}

build.dependsOn unitTest

dependencies {
    compile files('libs/junit-4.11-sources.jar')
    unitTestCompile 'junit:junit:4.11'
    unitTestCompile files("$project.buildDir/classes/debug")
    compile 'com.google.code.gson:gson:+'
    compile 'com.android.support:appcompat-v7:+'
    compile files('libs/libGoogleAnalyticsServices.jar')
    compile files('libs/sbc_mapslib.jar')
    compile files('libs/t21c2dm-lib-v1.0.jar')
}

然后我做一个简单的测试案例,看看junitis是否正常工作.但是当我运行它时,会出现此错误.

!!! JUnit version 3.8 or later expected:

我在其他一些问题中看到解决方案是,将Junit4.jar的依赖性改为第一位,但它不起作用