Improve the way specification version is checked in metadata #842
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Improve the way specification version is checked in metadata
and generate more friendly errors. Prior to this, a test in
test_updater.py was written in such a way to not actually be
testing whether or not specification version checking was
working correctly -- the error updater.py raised if a specification
version number was not supported was the same as would be raised
if a role version was not the expected version, and, amusingly,
the test could not distinguish between these two scenarios and
was providing the wrong role version......
Specification version mismatch now raises a particular error:
UnsupportedSpecificationError.
The specification version supported by this code is now also all
in one place, tuf.formats rather than tuf.updater.
Related error messages and testing were improved (with some
edge cases closed).