Add poll history scaffolding

RiotSwiftUI/Modules/Room/PollHistory/MockPollHistoryScreenState.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 Foundation
+import SwiftUI
+
+/// Using an enum for the screen allows you define the different state cases with
+/// the relevant associated data for each case.
+enum MockPollHistoryScreenState: MockScreenState, CaseIterable {
+    // A case for each state you want to represent
+    // with specific, minimal associated data that will allow you
+    // mock that screen.
+    case promptType(PollHistoryPromptType)
+    
+    /// The associated screen
+    var screenType: Any.Type {
+        PollHistory.self
+    }
+    
+    /// A list of screen state definitions
+    static var allCases: [MockPollHistoryScreenState] {
+        // Each of the presence statuses
+        PollHistoryPromptType.allCases.map(MockPollHistoryScreenState.promptType)
+    }
+    
+    /// Generate the view struct for the screen state.
+    var screenView: ([Any], AnyView) {
+        let promptType: PollHistoryPromptType
+        switch self {
+        case .promptType(let type):
+            promptType = type
+        }
+        let viewModel = PollHistoryViewModel(promptType: promptType)
+        
+        // can simulate service and viewModel actions here if needs be.
+        
+        return (
+            [promptType, viewModel],
+            AnyView(PollHistory(viewModel: viewModel.context)
+                .addDependency(MockAvatarService.example))
+        )
+    }
+}