public void GetExchangeRateOnceWillReturnRateFromInnerCurrency(decimal expectedExchangeRate, string currencyCode, [Frozen]Mock<Currency> innerCurrencyStub, CachingCurrency sut)
{
// Fixture setup
innerCurrencyStub.Setup(c => c.GetExchangeRateFor(currencyCode)).Returns(expectedExchangeRate);
// Exercise system
var result = sut.GetExchangeRateFor(currencyCode);
// Verify outcome
Assert.Equal<decimal>(expectedExchangeRate, result);
// Teardown (implicit)
}
public void CacheTimeoutWillMatchConstructorArgument()
{
// Fixture setup
var fixture = new Fixture();
var expectedTimeout = fixture.CreateAnonymous<TimeSpan>();
var sut = new CachingCurrency(new Mock<Currency>().Object, expectedTimeout);
// Exercise system
TimeSpan result = sut.CacheTimeout;
// Verify outcome
Assert.Equal<TimeSpan>(expectedTimeout, result);
// Teardown (implicit)
}
public override Currency GetCurrency(string currencyCode)
{
CachingCurrency currency;
if (this.cache.TryGetValue(currencyCode, out currency))
{
return currency;
}
currency = new CachingCurrency(this.innerProvider.GetCurrency(currencyCode), this.CacheTimeout);
this.cache.Add(currencyCode, currency);
return currency;
}
public override Currency GetCurrency(string currencyCode)
{
CachingCurrency currency;
if (this.cache.TryGetValue(currencyCode, out currency))
{
return(currency);
}
currency = new CachingCurrency(this.innerProvider.GetCurrency(currencyCode), this.CacheTimeout);
this.cache.Add(currencyCode, currency);
return(currency);
}
public void InnerCurrencyIsInvokedAgainWhenCacheExpires()
{
// Fixture setup
var currencyCode = "CHF";
var cacheTimeout = TimeSpan.FromHours(1);
var startTime = new DateTime(2009, 8, 29);
var timeProviderStub = new Mock<TimeProvider>();
timeProviderStub
.SetupGet(tp => tp.UtcNow)
.Returns(startTime);
TimeProvider.Current = timeProviderStub.Object;
var innerCurrencyMock = new Mock<Currency>();
innerCurrencyMock
.Setup(c => c.GetExchangeRateFor(currencyCode))
.Returns(4.911m)
.Verifiable();
var sut =
new CachingCurrency(innerCurrencyMock.Object,
cacheTimeout);
sut.GetExchangeRateFor(currencyCode);
sut.GetExchangeRateFor(currencyCode);
sut.GetExchangeRateFor(currencyCode);
timeProviderStub
.SetupGet(tp => tp.UtcNow)
.Returns(startTime + cacheTimeout);
// Exercise system
sut.GetExchangeRateFor(currencyCode);
// Verify outcome
innerCurrencyMock.Verify(
c => c.GetExchangeRateFor(currencyCode),
Times.Exactly(2));
// Teardown (implicit)
}
