public async Task ReturnNewDictionaryIfDictionaryFieldIsNull()
{
var apiRequester = new Mock <IAPIRequester>();
apiRequester.Setup(ar => ar.Request("https://api.exchangeratesapi.io/latest?base=USD&symbols=EUR,BGN,GBP,USD"))
.ReturnsAsync("{\"date\": \"2018-12-07\",\"rates\": {\"BGN\": 1.7199894468,\"USD\": 1,},\"base\": \"USD\"}");
var dateWrapper = new Mock <IDateWrapper>();
var date = DateTime.UtcNow;
dateWrapper.Setup(dw => dw.Now()).Returns(date);
var sut = new CurrencyRateApiService(apiRequester.Object, dateWrapper.Object);
Type sutType = typeof(CurrencyRateApiService);
FieldInfo dateTimeField = sutType.GetField("lastUpdate", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
dateTimeField.SetValue(sut, date.Subtract(TimeSpan.FromHours(25)));
var result = await sut.GetRatesAsync();
Assert.IsNotNull(result["USD"]);
Assert.IsNotNull(result["BGN"]);
Assert.AreEqual(1.7199894468, result["BGN"]);
Assert.AreEqual(1, result["USD"]);
}
public async Task ReturnSavedRatesIfCacheNotExpired()
{
var apiRequester = new Mock <IAPIRequester>();
var dateWrapper = new Mock <IDateWrapper>();
var date = DateTime.UtcNow;
dateWrapper.Setup(dw => dw.Now()).Returns(date);
var dictionary = new ConcurrentDictionary <string, double>();
dictionary["USD"] = 1;
var sut = new CurrencyRateApiService(apiRequester.Object, dateWrapper.Object);
Type sutType = typeof(CurrencyRateApiService);
FieldInfo ratesField = sutType.GetField("rates", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
ratesField.SetValue(sut, dictionary);
FieldInfo dateTimeField = sutType.GetField("lastUpdate", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
dateTimeField.SetValue(sut, date.AddHours(1));
var result = await sut.GetRatesAsync();
Assert.IsNotNull(result["USD"]);
Assert.AreEqual(1, result["USD"]);
}
