The reason some projects have both is so that some spec files can be
run in isolation, without the rails stuff. In practice, I don't find
myself ever doing this. So, the complexity of two files is unnecessary.
Test would fail when FFaker::Color.name returned the same exact
string twice in a row. This is not FFaker's fault.
Incidentally, the FFaker color list currently has 19 entries.
(https://github.com/ffaker/ffaker/blob/master/lib/ffaker/data/color/names_list)
The test suite runs this postgres-specific test six times (3 rubies * 2 major
versions of rails). So, I think the chance of the test suite failing was
(1 / 19)^2 * 6, or 0.016, or about 2%.
