Bug#1017916: lintian: false positive: runtime-test-file-uses-supported-python-versions-without-test-depends does not expand @builddeps@

[Simon McVittie <smcv@debian.org>]

Package: lintian
Version: 2.115.2
Severity: normal

src:pysdl2 has python3-all in its Build-Depends, and an autopkgtest
that is listed in d/tests/control with "Depends: @builddeps@" and
invokes py3versions -s.

Expected result: Lintian sees that the test has a dependency on
python3-all via @builddeps@, and does not emit a warning.

Actual result: Lintian flags this with

> runtime-test-file-uses-supported-python-versions-without-test-depends py3versions -s [debian/tests/upstream:9]

I think this probably implies that Lintian doesn't expand @builddeps@
before checking whether python3-all is a dependency.

    smcv