module-flavor1-androidTest-only

AndroidManifest.xml (module-flavor1-androidTest-only)

<?xml version="1.0" encoding="utf-8"?><!--
  Copyright 2015 The Android Open Source Project
  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
      http://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.
  -->
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.testing.blueprint.test">

    <!-- Specify runner and target application package -->
    <instrumentation
        android:name="android.support.test.runner.AndroidJUnitRunner"
        android:targetPackage="com.example.android.testing.blueprint.flavor1" />
    
    <application>
        <uses-library android:name="android.test.runner" />
    </application>
</manifest>

build.gradle (module-flavor1-androidTest-only)

//module-flavor1-androidTest-only build.gradle
apply plugin: 'com.android.test' // A plugin used for test-only-modules

android {
    compileSdkVersion rootProject.ext.compileSdkVersion
    buildToolsVersion rootProject.ext.buildToolsVersion

    defaultConfig {
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion

        // The package name of the test app
        testApplicationId 'com.example.android.testing.blueprint.test'
        // The Instrumentation test runner used to run tests.
        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }

    // Set the target app project. The module specified here should contain the production code
    // test should run against.
    targetProjectPath ':app'
    targetVariant 'flavor1Debug'
}

dependencies {
    // Android Testing Support Library's runner and rules and hamcrest matchers
    compile('com.android.support.test.espresso:espresso-core:2.2') {
        exclude group: 'com.android.support', module: 'support-annotations'
        exclude group: 'com.google.guava', module: 'guava'
        exclude group: 'junit', module: 'junit'
    }
    compile 'com.android.support.test:runner:' + rootProject.ext.runnerVersion
    compile 'com.android.support.test:rules:' + rootProject.ext.rulesVersion
    compile 'org.hamcrest:hamcrest-core:' + rootProject.ext.hamcrestVersion
}

build.gradle (root)

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

ext {
    minSdkVersion = 10
    targetSdkVersion = 23
    compileSdkVersion = 23
    buildToolsVersion = "24"

    supportLibVersion = "23.1.1"
    junitVersion = "4.12"
    mockitoVersion = "1.10.19"
    hamcrestVersion = "1.3"
    runnerVersion = "0.5"
    rulesVersion = "0.5"
    espressoVersion = "2.2.2"
    uiautomatorVersion = "2.1.2"
}

To run the tests from module-flavor1-androidTest-only, created a new configuration as shown below.

When I try to run the individual test from module-flavor1-androidTest-only; JUnit test configuration applied instead of Android Test.