我的AndroidTest软件包中不存在该软件包

Question

我正在做一个旧项目，我需要做一些测试。

首先，我将此行添加到了gradle中。

testInstrumentationRunner = 'android.support.test.runner.AndroidJUnitRunner'

然后，我将lib添加到了gradle中

testCompile 'junit:junit:4.12'
androidTestCompile 'com.android.support.test:runner:1.0.2'
androidTestCompile 'com.android.support.test:rules:1.0.2'

androidTestCompile "com.android.support.test.espresso:espresso-core:3.0.2"
androidTestCompile "com.android.support.test.espresso:espresso-contrib:3.0.2"

然后，我编写了一个简单的测试，即打开一个活动并单击一个按钮，这很简单，但是当我运行测试时，我enter code here会遇到如下错误：

error: package android.support.test.espresso does not exist
error: package android.support.test.filters does not exist
error: package android.support.test.runner does not exist
....

我认为这是因为我当前的 sourceSets 配置：

android {
    compileSdkVersion 22
    buildToolsVersion '28.0.3'

    defaultConfig {
        multiDexEnabled true
        minSdkVersion 22
        targetSdkVersion compile_sdk_version
        testInstrumentationRunner = 'android.support.test.runner.AndroidJUnitRunner'
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
            java.excludes = ['src/androidTest']
        }

        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
    }
    compileOptions {
        encoding encoding_type
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }

    lintOptions {
        abortOnError false
    }
    buildTypes {
        release {
            lintOptions {
                disable 'MissingTranslation'
            }
        }
    }

    dexOptions {
        preDexLibraries false
        javaMaxHeapSize heap_size
        jumboMode true
    }

}

在这一点上，我不知道为什么会这样。