Tests are not working when kotest isolationMode is other than SingleInstance

[michal-chojnacki]

Only first test is working when kotest isolationMode is different than SingleInstance, for example IsolationMode.InstancePerLeaf.

To reproduce for test

kotest-android/kotest-extensions-android/kotest-extensions-android-tests/src/test/kotlin/br/com/colman/kotest/android/extensions/ContainedRobolectricTest.kt

Line 59 in 4115ec0

class ContainedRobolectricRunnerMergeApiVersionTest : ContainedRobolectricRunnerMergeTest() {

we can add line with change of config: override fun isolationMode() = IsolationMode.InstancePerLeaf

After this change first test is passing and the second throws an error:

java.lang.NullPointerException
	at br.com.colman.kotest.android.extensions.robolectric.RobolectricExtension.runTestRobolectric(RobolectricExtension.kt:111)
	at br.com.colman.kotest.android.extensions.robolectric.RobolectricExtension.runTest(RobolectricExtension.kt:101)
	at br.com.colman.kotest.android.extensions.robolectric.RobolectricExtension.intercept(RobolectricExtension.kt:82)
	at io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invokeSuspend(TestExtensions.kt:140)
	at io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
	at io.kotest.engine.test.TestExtensions$intercept$execute$1$1.invoke(TestExtensions.kt)
	at io.kotest.engine.test.TestExtensions.intercept(TestExtensions.kt:148)
	at io.kotest.engine.test.interceptors.TestCaseExtensionInterceptor.intercept(TestCaseExtensionInterceptor.kt:24)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invokeSuspend(BeforeSpecListenerInterceptor.kt:50)
	at io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
	at io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor$intercept$runTest$1$4$1.invoke(BeforeSpecListenerInterceptor.kt)
	at io.kotest.engine.test.interceptors.BeforeSpecListenerInterceptor.intercept(BeforeSpecListenerInterceptor.kt:60)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.interceptors.TestEnabledCheckInterceptor.intercept(TestEnabledCheckInterceptor.kt:31)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invokeSuspend(CoroutineErrorCollectorInterceptor.kt:34)
	at io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
	at io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor$intercept$3.invoke(CoroutineErrorCollectorInterceptor.kt)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:61)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:163)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source)
	at io.kotest.engine.test.interceptors.CoroutineErrorCollectorInterceptor.intercept(CoroutineErrorCollectorInterceptor.kt:33)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invokeSuspend(TestCaseExecutor.kt:100)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.TestCaseExecutor$execute$3$1.invoke(TestCaseExecutor.kt)
	at io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invokeSuspend(coroutineDispatcherFactoryInterceptor.kt:57)
	at io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
	at io.kotest.engine.test.interceptors.CoroutineDispatcherFactoryInterceptor$intercept$4.invoke(coroutineDispatcherFactoryInterceptor.kt)
	at io.kotest.engine.concurrency.FixedThreadCoroutineDispatcherFactory$withDispatcher$4.invokeSuspend(FixedThreadCoroutineDispatcherFactory.kt:59)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)