Add demo use cases

CleanApp/Modules/DomainLayer/.swiftpm/xcode/xcshareddata/xcschemes/DomainLayer.xcscheme

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+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1400"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DomainLayer"
+               BuildableName = "DomainLayer"
+               BlueprintName = "DomainLayer"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      codeCoverageEnabled = "YES">
+      <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "DomainLayerTests"
+               BuildableName = "DomainLayerTests"
+               BlueprintName = "DomainLayerTests"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "DomainLayer"
+            BuildableName = "DomainLayer"
+            BlueprintName = "DomainLayer"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

CleanApp/Modules/DomainLayer/Sources/Entities/Todo.swift

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+//
+//  Todo.swift
+//  DomainLayer
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import Foundation
+
+public struct Todo: Equatable {
+    public var id: Int?
+    public var title: String
+    public var completed: Bool
+
+    public init(id: Int? = nil, title: String, completed: Bool = false) {
+        self.id = id
+        self.title = title
+        self.completed = completed
+    }
+}

CleanApp/Modules/DomainLayer/Sources/Protocols/Repositories/TodoRepository.swift

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+//
+//  TodoRepository.swift
+//  DomainLayer
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import Foundation
+
+public protocol TodoRepository {
+    func todos() async -> Result<[Todo], Error>
+    func complete(id: Int) async -> Result<Todo, Error>
+}

CleanApp/Modules/DomainLayer/Sources/UseCases/CompleteTodoUseCase.swift

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+//
+//  CompleteTodoUseCase.swift
+//  DomainLayer
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import Foundation
+
+public class CompleteTodoUseCase {
+    private let repository: TodoRepository
+
+    public init(repository: TodoRepository) {
+        self.repository = repository
+    }
+
+    public func execute(id: Int) async -> Result<Todo, Error> {
+        await repository.complete(id: id)
+    }
+}

CleanApp/Modules/DomainLayer/Sources/UseCases/GetAllTodosUseCase.swift

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+//
+//  GetAllTodosUseCase.swift
+//  DomainLayer
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import Foundation
+
+public class GetAllTodosUseCase {
+    private let repository: TodoRepository
+
+    public init(repository: TodoRepository) {
+        self.repository = repository
+    }
+
+    public func execute() async -> Result<[Todo], Error> {
+        await repository.todos()
+    }
+}

CleanApp/Modules/DomainLayer/Tests/Mocks/Entities/Todo+Mock.swift

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+//
+//  Todo+Mock.swift
+//  DomainLayerTests
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import DomainLayer
+import Foundation
+
+private var todos = [Todo]()
+
+extension Todo {
+    static func mock() -> Todo {
+        let id = todos.count + 1
+        return .init(id: id, title: "Mock #\(id)")
+    }
+}

CleanApp/Modules/DomainLayer/Tests/Mocks/Repositories/MockTodayRepository.swift

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+//
+//  MockTodoRepository.swift
+//  DomainLayerTests
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import Foundation
+import DomainLayer
+
+struct MockTodoRepository: TodoRepository {
+    var todosResult: Result<[Todo], Error>!
+    var completeResult: Result<Todo, Error>!
+
+    func todos() async -> Result<[Todo], Error> {
+        todosResult
+    }
+
+    func complete(id: Int) async -> Result<Todo, Error> {
+        completeResult
+    }
+}

CleanApp/Modules/DomainLayer/Tests/UseCases/GetAllTodosUseCaseTests.swift

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+//
+//  GetAllTodosUseCaseTests.swift
+//  DomainLayerTests
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import DomainLayer
+import XCTest
+
+final class GetAllTodosUseCaseTests: XCTestCase {
+    func testExecute() async throws {
+        // Arrange
+        let expected = [Todo.mock()]
+        let repository = MockTodoRepository(todosResult: .success(expected))
+        let sut = GetAllTodosUseCase(repository: repository)
+
+        // Act
+        let result = try await sut.execute().get()
+
+        // Assert
+        XCTAssertEqual(result, expected)
+    }
+}

CleanApp/Modules/DomainLayer/Tests/UseCases/GetTodayUseCaseTests.swift

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+//
+//  CompleteTodoUseCaseTests.swift
+//  DomainLayerTests
+//
+//  Created by Miguel Dönicke on 08.10.22.
+//
+
+import DomainLayer
+import XCTest
+
+final class CompleteTodoUseCaseTests: XCTestCase {
+    func testExecute() async throws {
+        // Arrange
+        let expected = Todo.mock()
+        let repository = MockTodoRepository(completeResult: .success(expected))
+        let sut = CompleteTodoUseCase(repository: repository)
+
+        // Act
+        let result = try await sut.execute(id: expected.id!).get()
+
+        // Assert
+        XCTAssertEqual(result, expected)
+    }
+}