Add AppLockSetupBiometricsScreen. (#1942)

UnitTests/Sources/AppLock/AppLockSetupBiometricsScreenViewModelTests.swift

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+//
+// 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 AppLockSetupBiometricsScreenViewModelTests: XCTestCase {
+    var appLockService: AppLockService!
+    var keychainController: KeychainControllerMock!
+    var viewModel: AppLockSetupBiometricsScreenViewModelProtocol!
+    
+    var context: AppLockSetupBiometricsScreenViewModelType.Context { viewModel.context }
+    
+    override func setUp() {
+        AppSettings.reset()
+        keychainController = KeychainControllerMock()
+        appLockService = AppLockService(keychainController: keychainController, appSettings: AppSettings())
+        viewModel = AppLockSetupBiometricsScreenViewModel(appLockService: appLockService)
+    }
+    
+    override func tearDown() {
+        AppSettings.reset()
+    }
+
+    func testAllow() async throws {
+        // Given a service that has biometric unlock disabled.
+        XCTAssertFalse(appLockService.biometricUnlockEnabled)
+        
+        // When allowing Touch/Face ID.
+        context.send(viewAction: .allow)
+        
+        // Then the service should now have biometric unlock enabled.
+        XCTAssertTrue(appLockService.biometricUnlockEnabled)
+    }
+
+    func testSkip() async throws {
+        // Given a service that has biometric unlock disabled.
+        XCTAssertFalse(appLockService.biometricUnlockEnabled)
+        
+        // When skipping biometrics.
+        context.send(viewAction: .skip)
+        
+        // Then the service should now have biometric unlock enabled.
+        XCTAssertFalse(appLockService.biometricUnlockEnabled)
+    }
+}

UnitTests/__Snapshots__/PreviewTests/test_appLockSetupBiometricsScreen.Face-ID.png

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+size 99917

UnitTests/__Snapshots__/PreviewTests/test_appLockSetupBiometricsScreen.Touch-ID.png

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+version https://git-lfs.github.com/spec/v1
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+size 111799