Fix flaky tests.

features/preferences/impl/src/test/kotlin/io/element/android/features/preferences/impl/developer/DeveloperSettingsPresenterTest.kt

@@ -26,8 +26,9 @@ import io.element.android.libraries.preferences.test.InMemoryAppPreferencesStore
 import io.element.android.tests.testutils.WarmUpRule
 import io.element.android.tests.testutils.awaitLastSequentialItem
 import io.element.android.tests.testutils.lambda.lambdaRecorder
-import kotlinx.coroutines.delay
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.test.advanceUntilIdle
 import kotlinx.coroutines.test.runTest
 import org.junit.Rule
 import org.junit.Test
@@ -154,6 +155,7 @@ class DeveloperSettingsPresenterTest {
         }
     }
 
+    @OptIn(ExperimentalCoroutinesApi::class)
     @Test
     fun `present - toggling simplified sliding sync changes the preferences and logs out the user`() = runTest {
         val logoutCallRecorder = lambdaRecorder<Boolean, String?> { "" }
@@ -169,15 +171,13 @@ class DeveloperSettingsPresenterTest {
             initialState.eventSink(DeveloperSettingsEvents.SetSimplifiedSlidingSyncEnabled(true))
             assertThat(awaitItem().isSimpleSlidingSyncEnabled).isTrue()
             assertThat(preferences.isSimplifiedSlidingSyncEnabledFlow().first()).isTrue()
-            // Give time for the logout to be called, but for some reason using runCurrent() is not enough
-            delay(2)
+            advanceUntilIdle()
             logoutCallRecorder.assertions().isCalledOnce()
 
             initialState.eventSink(DeveloperSettingsEvents.SetSimplifiedSlidingSyncEnabled(false))
             assertThat(awaitItem().isSimpleSlidingSyncEnabled).isFalse()
             assertThat(preferences.isSimplifiedSlidingSyncEnabledFlow().first()).isFalse()
-            // Give time for the logout to be called, but for some reason using runCurrent() is not enough
-            delay(2)
+            advanceUntilIdle()
             logoutCallRecorder.assertions().isCalledExactly(times = 2)
         }
     }