Issue
I'm planning to port my JUnit tests to Android Testing framework.
Some of the tests only involve the JVM but not the Android system, is it still necessary to port them? Android is using Dalvik and will replace it with ART(Android Runtime) in Lollipop, both of which are different from the JVM (Please correct if I'm wrong.). In this sense, it seems necessary to port all the JUnit tests to the Android Testing framework.
However, some tutorial argues that
"If possible, you should prefer to run your unit tests directly on the JVM as the test execution is much faster compared to the time required to deploy and run the test on an Android device." http://www.vogella.com/tutorials/AndroidTesting/article.html#androidtesting
I'm not an expert on JVM, Dalvik nor ART. Can someone clarify this issue? Is it necessary to port the tests that only involve JVM to Android Testing Framework?
Thanks!
Solution
This depends on what you would like to test and the environment in which you run your tests in.
In theory, pure non-Android-specific Java code (aka. POJOs) you write will work on whatever virtual machine you run it on--JVM, Dalvik, or ART.
If you agree with that theory, then if you are already running your tests on a JVM, there is no need to run it on Dalvik or ART, especially if you consider the speed at which JVM will execute the tests. (Running it on Dalvik involves building the apk, and installing it, and running an adb shell command which can take some time...)
Of course, if you feel that the behavior of your Java code may change depending on the runtime, then you should probably port those tests over to your Android tests.
Answered By - hopia
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