codelabs_kotlin_coroutines

build.gradle

/*
 * Copyright 2018 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.android.kotlincoroutines"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }

    kotlinOptions {
        jvmTarget = "1.8"
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.1.1'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.1.1'


    implementation 'androidx.appcompat:appcompat:1.1.0-alpha02'
    implementation 'com.google.android.material:material:1.1.0-alpha03'

    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'

    // ViewModel and LiveData
    def lifecycle_version = '2.0.0-beta01'
    implementation "androidx.lifecycle:lifecycle-extensions:$lifecycle_version"
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0-alpha02"
    testImplementation "androidx.arch.core:core-testing:$lifecycle_version"
    testImplementation "androidx.test:core:1.0.0"

    // Room for database
    def room_version = '2.0.0'
    implementation "androidx.room:room-runtime:$room_version"
    kapt "androidx.room:room-compiler:$room_version"

    implementation "androidx.work:work-runtime-ktx:2.2.0"

    androidTestImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.1.1'
    androidTestImplementation 'androidx.test:rules:1.1.1'
    androidTestImplementation "com.google.truth:truth:0.42"
    androidTestImplementation "androidx.test:core:1.0.0"
    androidTestImplementation "androidx.arch.core:core-testing:$lifecycle_version"
    androidTestImplementation "androidx.work:work-testing:2.2.0"

}

いまさらですけど、これでも、6ページ目のexperimentalなところのコードが動かないですね。
変数名がdispatcherと書いてあるところはtestDispatcherが正しいのと、もう1つ
build.gradleに

testImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.1'
androidTestImplementation 'org.jetbrains.kotlinx:kotlinx-coroutines-test:1.3.1'

の2行が必要で、バージョンを合わせる為にkotlinx-coroutines-coreも

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.1'

に変更が必要そう