TestingCancelAssertDataTasksCount1.swift

func test_cancellAllTasks_givenExistsActiveTasks_shouldCancellAllOfThem() {
  ...

  let getTasksExpectation = XCTestExpectation(description: "getTasksExpectation")
        
  var activeTasksCount: Int?
        
  sut.session.getAllTasks { tasks in
    activeTasksCount = tasks.count
    getTasksExpectation.fulfill()
  }
        
  wait(for: [getTasksExpectation], timeout: 0.2)
        
  XCTAssertEqual(activeTasksCount, 2)

  sut.cancelAllTasks()
}