Make LogoutUseCase.logout return the result of the SDK method.

features/lockscreen/impl/src/test/kotlin/io/element/android/features/lockscreen/impl/unlock/PinUnlockPresenterTest.kt

@@ -106,7 +106,7 @@ class PinUnlockPresenterTest {
 
     @Test
     fun `present - forgot pin flow`() = runTest {
-        val signOutLambda = lambdaRecorder<Boolean, String> { "" }
+        val signOutLambda = lambdaRecorder<Boolean, String?> { "" }
         val signOut = FakeLogoutUseCase(signOutLambda)
         val presenter = createPinUnlockPresenter(this, logoutUseCase = signOut)
         moleculeFlow(RecompositionMode.Immediate) {

features/logout/api/src/main/kotlin/io/element/android/features/logout/api/LogoutUseCase.kt

@@ -23,9 +23,10 @@ interface LogoutUseCase {
     /**
      * Log out the current user and then perform any needed cleanup tasks.
      * @param ignoreSdkError if true, the SDK error will be ignored and the user will be logged out anyway.
-     * @return the session id of the logged out user.
+     * @return an optional URL. When the URL is there, it should be presented to the user after logout for
+     * Relying Party (RP) initiated logout on their account page.
      */
-    suspend fun logout(ignoreSdkError: Boolean): String
+    suspend fun logout(ignoreSdkError: Boolean): String?
 
     interface Factory {
         fun create(sessionId: String): LogoutUseCase

features/logout/impl/src/main/kotlin/io/element/android/features/logout/impl/DefaultLogoutUseCase.kt

@@ -35,9 +35,9 @@ class DefaultLogoutUseCase @AssistedInject constructor(
         override fun create(sessionId: String): DefaultLogoutUseCase
     }
 
-    override suspend fun logout(ignoreSdkError: Boolean): String {
+    override suspend fun logout(ignoreSdkError: Boolean): String? {
         val matrixClient = matrixClientProvider.getOrRestore(SessionId(sessionId)).getOrThrow()
-        matrixClient.logout(ignoreSdkError = ignoreSdkError)
-        return sessionId
+        val result = matrixClient.logout(ignoreSdkError = ignoreSdkError)
+        return result
     }
 }

features/logout/test/src/main/kotlin/io/element/android/features/logout/test/FakeLogoutUseCase.kt

@@ -20,9 +20,9 @@ import io.element.android.features.logout.api.LogoutUseCase
 import io.element.android.tests.testutils.lambda.lambdaError
 
 class FakeLogoutUseCase(
-    var logoutLambda: (Boolean) -> String = lambdaError()
+    var logoutLambda: (Boolean) -> String? = { lambdaError() }
 ) : LogoutUseCase {
-    override suspend fun logout(ignoreSdkError: Boolean): String {
+    override suspend fun logout(ignoreSdkError: Boolean): String? {
         return logoutLambda(ignoreSdkError)
     }
 }

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

@@ -166,7 +166,7 @@ class DeveloperSettingsPresenterTest {
 
     @Test
     fun `present - toggling simplified sliding sync changes the preferences and logs out the user`() = runTest {
-        val logoutCallRecorder = lambdaRecorder<Boolean, String> { "" }
+        val logoutCallRecorder = lambdaRecorder<Boolean, String?> { "" }
         val logoutUseCase = FakeLogoutUseCase(logoutLambda = logoutCallRecorder)
         val preferences = InMemoryAppPreferencesStore()
         val presenter = createDeveloperSettingsPresenter(preferencesStore = preferences, logoutUseCase = logoutUseCase)