Bug#931881: diffoscope: undeclared versioned dependency on file

[Mattia Rizzolo]

On Fri, 12 Jul 2019, 6:09 pm Chris Lamb, <lamby at debian.org> wrote:

>   * DIFFOSCOPE_FAIL_TESTS_ON_MISSING_TOOLS=''
>     → Fails; the required version is missing and unlisted.
>
>   * DIFFOSCOPE_FAIL_TESTS_ON_MISSING_TOOLS="foo bar"
>     → Fails; the required version is missing and unlisted.
>

These shouldn't fail.  As in, the program is present, but the required
version is missing.  That variable isn't holding versions after all.

At least, having that fail in this case wasn't my intention when I wrote
that thing.  If you went down that route it would make that
variable/setting unusable in any circumstance where simply the required
version is missing.

Having said all of this, I think we should make the failing test able to
run with either of the file versions.  `file` keeps changing and breaking
our tests, but it would be awful to only support running the testsuite with
the latest version available.

>
>
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