public void AddOrExecute_SHOULD_return_proper_value()
{
//Arrange
var keyName = "GetDateTime";
var expectedValue = new DateTime(2020, 01, 02);
Func <DateTime> methodToExecute = () => expectedValue;
var cache = new MemoryCache();
//Act
var executionResult = cache.AddOrExecute <DateTime>(keyName, methodToExecute);
//Assert
executionResult.Should().Be(expectedValue);
}