UIAutomator2.0を使ったAndroid UI Testの準備 ref: http://qiita.com/Yuki_312/items/c4e2138aff9fcaf02afd

file0.txt

android {
    defaultConfig {
        minSdkVersion 18  // Requires Android 4.3 (API level 18)
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    packagingOptions {
        exclude 'LICENSE.txt'  // Duplicate files copied
    }
}

dependencies {
    // Testing-only dependencies
    androidTestCompile 'com.android.support.test:testing-support-lib:0.1'
    // UiAutomator Testing
    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.0.0'
}

file1.java

import android.support.test.filters.SdkSuppress;
import android.support.test.runner.AndroidJUnit4;

@RunWith(AndroidJUnit4.class)
@SdkSuppress(minSdkVersion = 18)
public class ApplicationTest {

}

file2.java

// Copyright 2015, The Android Open Source Project

@Before
public void startMainActivityFromHomeScreen() {
        // Initialize UiDevice instance
        mDevice = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation());

        // Start from the home screen
        mDevice.pressHome();

        // Wait for launcher
        final String launcherPackage = getLauncherPackageName();
        assertThat(launcherPackage, notNullValue());
        mDevice.wait(Until.hasObject(By.pkg(launcherPackage).depth(0)), LAUNCH_TIMEOUT);

        // Launch the blueprint app
        Context context = InstrumentationRegistry.getContext();
        final Intent intent = context.getPackageManager()
                .getLaunchIntentForPackage(BASIC_SAMPLE_PACKAGE);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);    // Clear out any previous instances
        context.startActivity(intent);

        // Wait for the app to appear
        mDevice.wait(Until.hasObject(By.pkg(BASIC_SAMPLE_PACKAGE).depth(0)), LAUNCH_TIMEOUT);
    }