RandomAttribute
RandomAttribute is used to supply a set of random _values
to a single parameter of a parameterized test.
Construct a set of Enums if the type is an Enum otherwise
Construct a set of doubles from 0.0 to 1.0,
specifying only the count.
Construct a set of doubles from min to max
Construct a set of ints from min to max
Get the collection of _values to be used as arguments