在kotlin测试

我是kotlin开发kotlin 。 在我的应用程序中，我想编写测试用例，但是我无法使用它。 Src / test / kotlin文件夹没有被创建

gradle这个

 android { compileSdkVersion 27 defaultConfig { applicationId "in.getparking.getparkingattendant" minSdkVersion 23 targetSdkVersion 27 versionCode 1 versionName "1.0" multiDexEnabled true testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } sourceSets { test.java.srcDirs += 'src/test/kotlin' androidTest.java.srcDirs += 'src/androidTest/kotlin' } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" implementation 'com.android.support.constraint:constraint-layout:1.0.2' implementation 'com.google.firebase:firebase-database:11.8.0' implementation 'com.firebase:geofire-android:2.2.0' implementation 'com.google.firebase:firebase-auth:11.8.0' implementation 'com.google.firebase:firebase-firestore:11.8.0' implementation 'com.android.support:appcompat-v7:27.0.2' implementation 'com.android.support:support-media-compat:27.0.2' implementation 'com.android.support:support-v4:27.0.2' implementation 'com.android.support:design:27.0.2' implementation 'com.android.support:recyclerview-v7:27.0.2' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:0.21' implementation 'com.android.support:cardview-v7:27.0.2' /*for testing*/ testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.0.0-M4' testCompile "org.junit.platform:junit-platform-runner:1.0.0-M4" testCompile "org.jetbrains.spek:spek-api:1.1.5" testCompile "org.jetbrains.spek:spek-junit-platform-engine:1.1.5" testCompile "io.kotlintest:kotlintest:2.0.4" } 

如果我运行一个androidTest我得到"No class found error"也是好的kotlintest或spek？