public async Task Instance_GivenUnexpired_ShouldRefreshAndReturnOldValue()
{
// Arrange.
const int cacheLifetimeInSeconds = 5;
string[] values = { "abc", "def" };
int valueIndex = 0;
var time = Substitute.For <IDateTimeService>();
var timeAtInstantiation = new DateTime();
var refreshable = new Refreshable();
time
.Now
.Returns(timeAtInstantiation);
var testObject = new TimeBasedAutoRefresher <Refreshable>(
refreshable,
time,
cacheLifetimeInSeconds,
() => refreshable.Refresh(values[valueIndex++]));
await testObject.Instance();
time
.Now
.Returns(timeAtInstantiation.AddSeconds(cacheLifetimeInSeconds - 1));
// Act.
Refreshable result = await testObject.Instance();
// Assert.
Assert.AreEqual(values[0], result.Value);
}
public async Task Instance_GivenFirstCall_ShouldRefreshAndReturnValue()
{
// Arrange.
const int cacheLifetimeInSeconds = 5;
const string value = "abc";
var time = Substitute.For <IDateTimeService>();
var timeAtInstantiation = new DateTime();
var refreshable = new Refreshable();
time
.Now
.Returns(timeAtInstantiation);
var testObject = new TimeBasedAutoRefresher <Refreshable>(
refreshable,
time,
cacheLifetimeInSeconds,
() => refreshable.Refresh(value));
time
.Now
.Returns(timeAtInstantiation.AddSeconds(cacheLifetimeInSeconds - 1));
// Act.
Refreshable result = await testObject.Instance();
// Assert.
Assert.AreEqual(value, result.Value);
}