Add test for ChangeServerPresenter

libraries/architecture/src/main/kotlin/io/element/android/libraries/architecture/Async.kt

@@ -39,7 +39,8 @@ sealed interface Async<out T> {
 suspend fun <T> (suspend () -> T).execute(state: MutableState<Async<T>>) {
     try {
         state.value = Async.Loading()
-        state.value = Async.Success(this())
+        val result = this()
+        state.value = Async.Success(result)
     } catch (error: Throwable) {
         state.value = Async.Failure(error)
     }

libraries/matrixtest/src/main/kotlin/io/element/android/libraries/matrixtest/auth/FakeAuthenticationService.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.matrixtest.auth
+
+import io.element.android.libraries.matrix.MatrixClient
+import io.element.android.libraries.matrix.auth.MatrixAuthenticationService
+import io.element.android.libraries.matrix.core.SessionId
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flowOf
+
+const val A_HOMESERVER = "matrix.org"
+
+class FakeAuthenticationService : MatrixAuthenticationService {
+    override fun isLoggedIn(): Flow<Boolean> {
+        return flowOf(false)
+    }
+
+    override suspend fun getLatestSessionId(): SessionId? {
+        return null
+    }
+
+    override suspend fun restoreSession(sessionId: SessionId): MatrixClient? {
+        return null
+    }
+
+    override fun getHomeserver(): String? {
+        return null
+    }
+
+    override fun getHomeserverOrDefault(): String {
+        return A_HOMESERVER
+    }
+
+    override suspend fun setHomeserver(homeserver: String) {
+        delay(100)
+    }
+
+    override suspend fun login(username: String, password: String): SessionId {
+        return SessionId("test")
+    }
+}