public void EmptyCache()
{
// Arrange
var timeSpan = TimeSpan.FromSeconds(int.Parse("20"));
var className = "Project";
var methodName = "ToString()";
object obj = new object();
// Act
var sut = new CachingService(timeSpan);
sut.AddCacheValue(className, methodName, obj);
sut.ResetCache();
// Assert
Assert.ThrowsException <KeyNotFoundException>(() => sut.GetCacheValue(className, methodName));
}