I get the following exception in my tests after upgrading de

Question

I get the following exception in my tests after upgrading decompose to 1 0 0 `Access from different threads is detected must be on the main thread only Current thread AWT EventQueue 0 coroutine 5082 First thread AWT EventQueue 0 coroutine 11 ` Thown here ```withContext Dispatchers Main immediate push configuration onComplete lt ``` Any idea what s the problem

Arkadii Ivanov · Answer

Most likely you created the root component on non UI thread Try following <https arkivanov github io Decompose component overview jvmdesktop with compose|https arkivanov github io Decompose component overview jvmdesktop with compose>

Arkadii Ivanov · Answer

If this is already what you are doing or the problem is still there Try adding the following at the very beginning of your application fun main runOnUiThread val value = MutableValue 0 value value = 1 The rest of the code This will remember the correct thread and all subsequent violations should throw proper stack traces

benkuly · Answer

Hm okay This does not work ```withContext Dispatchers Main immediate ``` Notice It is common test code Therefore only a few view models are created

Arkadii Ivanov · Answer

Ahh this is in tests I missed that

Arkadii Ivanov · Answer

Could you post your test here

benkuly · Answer

I can try creating a minimal reproducer

Arkadii Ivanov · Answer

That would be very helpful

Arkadii Ivanov · Answer

The problem may be that you are using the real main dispatcher in tests This may trigger the check And this also makes your tests asynchronous You can pass all used dispatchers via constructor with default values and replace them in tests E g with StandardTestDispatcher or UnconfinedDispatcher I will add an API to disable main thread checks in the next version just in case one still wants to use real Dispatchers

Evegenii Khokhlov · Answer

Also `kotlinx coroutines test` has very handy `Dispatchers setMain ` method

Arkadii Ivanov · Answer

Yes this can be also used Here are some docs Android but still can be useful <https developer android com kotlin coroutines test setting main dispatcher>

benkuly · Answer

Setting `Dispatchers setMain ` and don t using real main dispatchers was the trick Thank you slightly smiling face