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));
        }