Create change password screen

RiotSwiftUI/Modules/Settings/ChangePassword/Test/Unit/ChangePasswordViewModelTests.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
+
+@testable import RiotSwiftUI
+
+class ChangePasswordViewModelTests: XCTestCase {
+
+    @MainActor func testEmptyState() async {
+        let viewModel = ChangePasswordViewModel()
+        let context = viewModel.context
+
+        // Given an empty view model
+        XCTAssert(context.oldPassword.isEmpty, "The view model should start with an empty old password.")
+        XCTAssert(context.newPassword1.isEmpty, "The view model should start with an empty new password 1.")
+        XCTAssert(context.newPassword2.isEmpty, "The view model should start with an empty new password 2.")
+        XCTAssertFalse(context.viewState.canSubmit, "The view model should not be able to submit.")
+        XCTAssertTrue(context.signoutAllDevices, "The view model should start with sign out of all devices checked.")
+    }
+
+    @MainActor func testValidState() async {
+        let viewModel = ChangePasswordViewModel(oldPassword: "12345678",
+                                                newPassword1: "87654321",
+                                                newPassword2: "87654321",
+                                                signoutAllDevices: false)
+        let context = viewModel.context
+
+        // Given a filled view model in valid state
+        XCTAssertFalse(context.oldPassword.isEmpty, "The view model should start with an empty old password.")
+        XCTAssertFalse(context.newPassword1.isEmpty, "The view model should start with an empty new password 1.")
+        XCTAssertFalse(context.newPassword2.isEmpty, "The view model should start with an empty new password 2.")
+        XCTAssertTrue(context.viewState.canSubmit, "The view model should be able to submit.")
+        XCTAssertFalse(context.signoutAllDevices, "Sign out of all devices should be unchecked.")
+    }
+
+}