public void EnsureLeastAccessedItemWasRemoved()
{
// Arrange
var expectedMaxCount = 3;
var sut = new ConcurrentDictionaryExpiringCache <int, string>(expectedMaxCount);
var expectedItem = "i'm still here";
// Act
sut.Add(1, "foo");
sut.Add(2, "deleted");
sut.Add(3, "baz");
sut.Add(1, expectedItem);
sut.Add(4, "four");
var actualCount = sut.Count;
var actualResult = sut.TryGet(1, out var actualValue);
var tryGetValueThatIsNotInTheCache = sut.TryGet(2, out var missingItem);
// Assert
Assert.Equal(expectedMaxCount, actualCount);
Assert.True(actualResult);
Assert.Equal(expectedItem, actualValue);
Assert.False(tryGetValueThatIsNotInTheCache);
Assert.Null(missingItem);
}
public void ImplementsInterface()
{
// Arrange
// Act
var sut = new ConcurrentDictionaryExpiringCache <string, string>();
// Assert
Assert.IsAssignableFrom <IExpiringCache <string, string> >(sut);
}
public void ReturnsFalseIfThereIsNoValue()
{
// Arrange
var sut = new ConcurrentDictionaryExpiringCache <string, string>();
// Act
var actual = sut.TryGet("foo", out var result);
// Assert
Assert.False(actual);
}
public void ReturnsAddedValue()
{
// Arrange
var sut = new ConcurrentDictionaryExpiringCache <string, string>();
var expectedItem = "bar";
// Act
sut.Add("foo", expectedItem);
var result = sut.TryGet("foo", out var actualItem);
// Assert
Assert.True(result);
Assert.Equal(expectedItem, actualItem);
}
public void ReturnsFalseIfTheItemIsExpired()
{
// Arrange
var sut = new ConcurrentDictionaryExpiringCache <string, string>();
var expired = "expired";
// Act
sut.Add("foo", expired, TimeSpan.FromSeconds(2));
Thread.Sleep(3000);
var result = sut.TryGet("foo", out var actualItem);
// Assert
Assert.False(result);
Assert.Null(actualItem);
}
public void MaxCapacityNotExceeded()
{
// Arrange
var expectedMaxCount = 2;
var sut = new ConcurrentDictionaryExpiringCache <int, string>(expectedMaxCount);
// Act
sut.Add(1, "foo");
sut.Add(2, "bar");
sut.Add(3, "baz");
var actualCount = sut.Count;
// Assert
Assert.Equal(expectedMaxCount, actualCount);
}
public void UpdatesItemExpirationTime()
{
// Arrange
var sut = new ConcurrentDictionaryExpiringCache <string, string>();
var expired = "expired";
var notExpired = "not expired";
// Act
sut.Add("foo", expired, TimeSpan.FromSeconds(2));
sut.Add("foo", notExpired, TimeSpan.FromSeconds(8));
Thread.Sleep(3000);
var result = sut.TryGet("foo", out var actualItem);
// Assert
Assert.True(result);
Assert.Equal(notExpired, actualItem);
}
