doFormat unittests

[John-Colvin]

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the unittests for the doFormat module don't actually ever call doFormat, the only public function in the module. They appear to be the wrong tests copied over from std.format

[John-Colvin]

my mistake. doFormat never had any tests :o

[John-Colvin]

a minimal fix is in https://github.com/dlang/undeaD/pull/15

[John-Colvin]

#15 is now merged, but that's a very minimal unittest for such a lot of code.