Wednesday, August 9, 2017

Android JUnit @BeforeClass flakiness for longer running routines

Using @BeforeClass in a JUnit test seems like a great way to make tests run more efficiently. Surely it's a natural place to put long-running setup routines!

Unfortunately, Android's test runner in Android Studio will, depending on how it feels, might run the next test, might skip the next test, might skip a couple more tests just for good measure, or it might just give up the tests entirely. Looking for an error message or a hint?

So instead of a nice elegant solution:
public static void someSlowSetupRoutine() {
    //run long running code
We must put the long running procedure in the test itself and use an if statement to avoid running it multiple times to speed things up:
public void someTest() {
        //run setup

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