Hands-On Design Patterns with Swift

Stub test double: a predefined collaborator

A test stub is a collaborator that has canned returns so that we can control the indirect input of the SUT.

Considering the example of the fake, we create a Stub that already has two tasks:

class StubTaskStoreWithTwoTasks: TaskStore {    private(set) var allTasks = [Task(), Task()]    func add(task: Task) {        allTasks.append(task)    }}

The test is as follows:

func testAddATaskToPreloadedTasks() {    let taskManager = TaskManager(store: StubTaskStoreWithTwoTasks())    taskManager.add(task: Task())    XCTAssertEqual(taskManager.count, 3)}