Set up Analytics to track data per session (#780)

UnitTests/Sources/AnalyticsSettingsScreenViewModelTests.swift

@@ -0,0 +1,54 @@
+//
+// Copyright 2022 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
+
+@testable import ElementX
+
+@MainActor
+class AnalyticsSettingsScreenViewModelTests: XCTestCase {
+    private var applicationSettings: AppSettings!
+    private var viewModel: AnalyticsSettingsScreenViewModelProtocol!
+    private var context: AnalyticsSettingsScreenViewModelType.Context!
+    
+    @MainActor override func setUpWithError() throws {
+        AppSettings.configureWithSuiteName("io.element.elementx.unitests")
+        AppSettings.reset()
+        applicationSettings = AppSettings()
+        ServiceLocator.shared.register(appSettings: applicationSettings)
+        let analyticsClient = AnalyticsClientMock()
+        analyticsClient.isRunning = false
+        ServiceLocator.shared.register(analytics: Analytics(client: analyticsClient))
+        
+        viewModel = AnalyticsSettingsScreenViewModel()
+        context = viewModel.context
+    }
+
+    func testInitialState() {
+        XCTAssertFalse(context.enableAnalytics)
+    }
+
+    func testOptIn() {
+        context.send(viewAction: .toggleAnalytics)
+        XCTAssertTrue(context.enableAnalytics)
+    }
+    
+    func testOptOut() {
+        applicationSettings.enableAnalytics = true
+        context.send(viewAction: .toggleAnalytics)
+        XCTAssertFalse(context.enableAnalytics)
+    }
+}