This is a simple project for Android Studio using Kotlin and Espresso for UI tests. It also includes typical unit tests using JUnit4. All codes are written in Kotlin 🎉

• How to implement UI tests using Espresso and logic tests (without UI) using JUnit4
• Fundamental Kotlin language and basic usage
• Thanks to RxJava, we can implement a calculator by less than 100 lines! 🚀

• Kotlin: 1.1.3-2
• RxJava: 2.1.1
• Espresso: 2.2.2 (espresso-core)

There is very simple calculator :)

Note: You should have a connected device in advance before running UI tests. It doesn't matter if it's a simulator and a real one.

	UI Tests (using Espresso)	Logic Tests (using JUnit4)
gradle task name	connectedAndroidTest	testDebugUnitTest
root path of test files	src/androidTest/kotlin	src/test/kotlin
prefix of dependencies defined in build.gradle	androidTestCompile	testCompile

MIT