File8.swift

// preparation
var priceAlertApiService = PriceAlertApiServiceMock()
var priceAlertStorageService = PriceAlertStorageServiceMock()

let repository = PriceAlertRepository(
	network: priceAlertApiService,
	storage: priceAlertStorageService
)

// actual test
priceAlertStorageService.cachedPriceAlertsMockFunc.returns(
	[.sample(id: "1"), .sample(id: "2")]
)

let result = repository.cachedPriceAlerts(symbol: "AAPL")
expect(result.map { $0.id }) == ["1", "2"]