Session overview screen

RiotSwiftUI/Modules/UserSessions/UserSessionOverview/Test/Unit/UserSessionOverviewViewModelTests.swift

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+// 
+// Copyright 2021 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.
+//
+
+import XCTest
+import Combine
+
+@testable import RiotSwiftUI
+
+class UserSessionOverviewViewModelTests: XCTestCase {
+    private enum Constants {
+        static let presenceInitialValue: UserSessionOverviewPresence = .offline
+        static let displayName = "Alice"
+    }
+    var service: MockUserSessionOverviewService!
+    var viewModel: UserSessionOverviewViewModelProtocol!
+    var context: UserSessionOverviewViewModelType.Context!
+    var cancellables = Set<AnyCancellable>()
+    override func setUpWithError() throws {
+        service = MockUserSessionOverviewService(displayName: Constants.displayName, presence: Constants.presenceInitialValue)
+        viewModel = UserSessionOverviewViewModel.makeUserSessionOverviewViewModel(userSessionOverviewService: service)
+        context = viewModel.context
+    }
+
+    func testInitialState() {
+        XCTAssertEqual(context.viewState.displayName, Constants.displayName)
+        XCTAssertEqual(context.viewState.presence, Constants.presenceInitialValue)
+    }
+
+    func testFirstPresenceReceived() throws {
+        let presencePublisher = context.$viewState.map(\.presence).removeDuplicates().collect(1).first()
+        XCTAssertEqual(try xcAwait(presencePublisher), [Constants.presenceInitialValue])
+    }
+
+    func testPresenceUpdatesReceived() throws {
+        let presencePublisher = context.$viewState.map(\.presence).removeDuplicates().collect(3).first()
+        let awaitDeferred = xcAwaitDeferred(presencePublisher)
+        let newPresenceValue1: UserSessionOverviewPresence = .online
+        let newPresenceValue2: UserSessionOverviewPresence = .idle
+        service.simulateUpdate(presence: newPresenceValue1)
+        service.simulateUpdate(presence: newPresenceValue2)
+        XCTAssertEqual(try awaitDeferred(), [Constants.presenceInitialValue, newPresenceValue1, newPresenceValue2])
+    }
+}