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Can someone please enlighten me on unit testing wi...
# multiplatform
n
Can someone please enlighten me on unit testing with Kotlin multiplatform? As I understand it, 
commonMain
and 
commonTest
SourceSets
exist regardless of the target. If my project only has ios and android targets, does that mean I can't run unit tests on the common code contained in 
commonTest/test
?
b
common code is executed for each platform you support. So commonTest will just be run for each platform that you run unit tests
n
"So commonTest will just be fun for each platform that you run unit tests" can you elaborate on this, please?
b
Whoops typo. Fixed.
When you run tests for iOS, it'll run tests in commonTest + iosTest. When you run android tests, it'll run tests in commonTest and androidTest
n
So there's no way to just execute the tests that are in commonTest?
b
You could (with some configuring probably), but which platform would you run them on? There's no platform independent artifact. Ultimately, the code has to run on a particular platform
n
Interesting, I would have thought common has an implicit JVM platform being Kotlin and all
b
Nope. If you want that, you add JVM as a target, and then you run JVM tests
n
So I should conceptually imagine my common code to have a runtime of some platform rather than generic JVM code that can be compiled to a platform native binary.
👌 1
lol if that makes sense for where the confusion is coming from
b
Common misconception is that common implies some kind of platform-independent artifact or something. It's really more just about it being common to all sources, so it can't uses platform-specific code/libraries and must be compatible with all targets
n
^ exactly. Yeah, I guess I got bit by that misconception.
Thank you so much for the clarification.
b
No prob 👍
l
interesting! does that imply, that tests in 
commonTest
aren’t supposed to be runnable from AS/IDEA? i was wondering why the 
run as test
button is not showing up for my common test
b
They should be runnable, but support varies based on the targets you have setup + bugs: 1. Native targets are newer, and IDEA support is still "up and coming" 2. JVM/android targets should work fine 3. Pretty sure there are new bugs in Kotlin 1.3.60 that broke support for 2. Should be fixed in 1.3.70
l
thought as much. thx!
👍 1
s
FWIW, I usually use a JVM target for running tests while I’m developing because they run the fastest. Every once in a while I do a sanity check on the other platforms.
n
@Sam yeah, that's what I ended up doing. The unit tests I was writing were simple enough and basically sanity checks. I just needed fast feedback.
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