Simplified SpecimenBuilder

[jzabroski]

AutoFixture has default specimens for various well-known types, and also has some supplemental specimens.

Example: RandomDateTimeSequenceGenerator is the default DateTime generator, which generates a DateTime +/- two years from the current date. There is also StrictlyMonotonicallyIncreasingDateTimeGenerator and CurrentDateTimeGenerator.

However, most of the time, what I want to be able to say is something like:

var runOnBusinessDate = Fixture.Freeze<DateTime>(DateTimeSpecimen.Weekday);
var previousBusinessDate = Fixture.Freeze<DateTime>(DateTimeSpecimen.Friday);

It would be great if there was better interoperability such that specimen building didn't require so much Customizations.Add ceremony.

Traditionally, Mark has suggested domain modeling to avoid such problems, but the bottom line is its sometimes convenient just to easily communicate some intent without a ton of ceremony. Is the test perfect? No. But does Jimmy Page keep on riffing when he misses a chord? Yes!