Add some tests.

# Conflicts:
#	ElementX.xcodeproj/project.pbxproj

ElementX/Sources/Mocks/RoomSummaryProviderMock.swift

@@ -73,7 +73,7 @@ extension RoomSummary {
     static func mock(id: String,
                      name: String,
                      canonicalAlias: String? = nil) -> RoomSummary {
-        RoomSummary(room: RoomSDKMock(),
+        RoomSummary(room: RoomSDKMock(.init()),
                     id: id,
                     joinRequestType: nil,
                     name: name,

ElementX/Sources/Mocks/SDK/RoomSDKMock.swift

@@ -0,0 +1,22 @@
+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+import MatrixRustSDKMocks
+
+nonisolated extension RoomSDKMock {
+    struct Configuration {
+        var membership: Membership = .joined
+    }
+    
+    convenience init(_ configuration: Configuration) {
+        self.init()
+        
+        membershipReturnValue = configuration.membership
+    }
+}