android studio 測試

step 1./src/.
建立test com example app等資料夾

step 2. build.gradle
  sourceSets {
        instrumentTest.setRoot('src/test')
    }

step 3. "Sync Project with Gradle Files"

Tool -> Android ->Sync Project with Gradle Files

如果已經有test 資料夾他就不會當作source test

中文參考
http://yrulee.logdown.com/posts/233710-android-studio-start-with-unit-test

Unit Test參考
Unit Test