Add a simple screen SwiftUI template.

RiotSwiftUI/Modules/Template/SimpleScreenExample/Test/UI/TemplateSimpleScreenUITests.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 RiotSwiftUI
+
+@available(iOS 14.0, *)
+class TemplateSimpleScreenUITests: MockScreenTest {
+
+    override class var screenType: MockScreenState.Type {
+        return MockTemplateSimpleScreenScreenState.self
+    }
+
+    override class func createTest() -> MockScreenTest {
+        return TemplateSimpleScreenUITests(selector: #selector(verifyTemplateSimpleScreenScreen))
+    }
+
+    func verifyTemplateSimpleScreenScreen() throws {
+        guard let screenState = screenState as? MockTemplateSimpleScreenScreenState else { fatalError("no screen") }
+        switch screenState {
+        case .promptType(let promptType):
+            verifyTemplateSimpleScreenPromptType(promptType: promptType)
+        }
+    }
+    
+    func verifyTemplateSimpleScreenPromptType(promptType: TemplateSimpleScreenPromptType) {
+        let title = app.staticTexts["title"]
+        XCTAssert(title.exists)
+        XCTAssertEqual(title.label, promptType.title)
+    }
+
+}