public async Task GetLatestRateTests()
{
var client = Helpers.GetHttpClient(
"{\"base\":\"EUR\",\"date\":\"2018-04-08\",\"rates\":{\"CAD\":1.565,\"CHF\":1.1798,\"GBP\":0.87295,\"SEK\":10.2983,\"EUR\":1.092,\"USD\":1.2234}}");
var sut = new ExchangeRateService(client, _cache, _configurationMock.Object, _loggerMock.Object);
// first run should get data from api mock
var result = await sut.GetLatestRate("EUR,GBP");
Assert.IsAssignableFrom <ExchangeRate>(result);
Assert.Contains(result.Rates, i => i.Key == "CAD" && i.Value == (decimal)1.565);
// second run should get data from cache
client = Helpers.GetHttpClient("{}");
sut = new ExchangeRateService(client, _cache, _configurationMock.Object, _loggerMock.Object);
result = await sut.GetLatestRate("EUR,GBP");
Assert.IsAssignableFrom <ExchangeRate>(result);
Assert.Contains(result.Rates, i => i.Key == "CAD" && i.Value == (decimal)1.565);
}