hi there, I'm trying to run an UI test in shared/commonTest and facing the following NPE. This tests...

# multiplatform

[Kathrin]

hi there,
I'm trying to run an UI test in shared/commonTest and facing the following NPE.
This tests works fine when I run it in androidInstrumentedTest.
Any ideas?

java.lang.NullPointerException: Cannot invoke "String.toLowerCase(java.util.Locale)" because "android.os.Build.FINGERPRINT" is null
	at androidx.compose.ui.test.AndroidComposeUiTestEnvironment.runTest(ComposeUiTest.android.kt:314)
	at androidx.compose.ui.test.ComposeUiTest_androidKt.runAndroidComposeUiTest(ComposeUiTest.android.kt:114)
	at androidx.compose.ui.test.ComposeUiTest_androidKt.runComposeUiTest(ComposeUiTest.android.kt:61)
	at androidx.compose.ui.test.ComposeUiTest_androidKt.runComposeUiTest$default(ComposeUiTest.android.kt:60)

[Alexandru Caraus]

Android.os.Build.FINGERPRINT is android specific and its used in commonTest, that will not work

[Alexandru Caraus]

The commonTest should use only kotlin code and its agnostic of theplatform

[Kathrin]

thank you @Alexandru Caraus
I was referring to the test example on https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-test.html#writing-and-running-tests-with-compose-multiplatform

there is an implementation of a common test - so this won't work for android, do I understand it right?

[Alexandru Caraus]

It should work for android

[Alexandru Caraus]

The commonTest should test everything from common. And in common you should not reference anything android or ios, or any other platform. You would need to mock probably some expect/actual.

[Alexandru Caraus]

From the error you have its clear that the commonTest tries to run something android specific, and that should not be allowed.

[Alexandru Caraus]

Hope its clear.

[Atul Gupta]

Is this planned to be fixed? If yes is there any tracking bug id?

This crashes even for common compose code when run using allTest (when ran for android environment)

[Atul Gupta]

Or should this be an issue on Google's side as this crash happens on ComposeUiTest.android.kt ?

[John O'Reilly]

Also running in to this just running say testDebugUnitTest

[John O'Reilly]

have small repro in following branch https://github.com/joreilly/ClimateTraceKMP/tree/cmp_tests

[John O'Reilly]

this is only test in commonTest so definitely nothing android related

@Test
    fun myFirstTest() = runComposeUiTest {
        setContent {
            Text("hi")
        }

        onNodeWithText("hi").assertExists()
    }

[John O'Reilly]

running desktopTest works fine (using jvm target)

[John O'Reilly]

fwiw following seems to work to at least prevent the CMP UI tests (that are for example in screen folder in commonTest) from running as part of testDebugUnitTest test run....they still run when using connectedAndroidTest (cc @Marco Pierucci)

testOptions {
        unitTests {
            all {
                it.exclude("**/screen/**")
            }
        }
    }

[John O'Reilly]

also can run for example allTests and that will run all tests on all platforms (but won't run the screen one when running for android (local) because of the testOptions filter mentioned above ) ....updated https://github.com/joreilly/ClimateTraceKMP/tree/cmp_tests branch with those changes

[Marco Pierucci]

Excellent! We can agree on add all UI test in ui package or something and start adding tests then

[Marco Pierucci]

Thanks!