Bug#861952: libcgi-validop-perl: FTBFS on May 1st (?)

[Santiago Vila]

Package: src:libcgi-validop-perl
Version: 0.56-2
Severity: important

Hello Gregor et al.

I tried to build this package in stretch with "dpkg-buildpackage -A"
but it failed:

--------------------------------------------------------------------------------
[...]

#   Failed test 't/16check_date.t : 246'
#   at lib/CGI/ValidOp/Test.pm line 108.
#          got: undef
#     expected: '2017-04-31'
# Looks like you failed 1 test of 607.
t/16check_date.t .......... 

[...]

Test Summary Report
-------------------
t/16check_date.t        (Wstat: 256 Tests: 607 Failed: 1)
  Failed test:  506
  Non-zero exit status: 1
Files=24, Tests=3133,  3 wallclock secs ( 0.39 usr  0.13 sys +  2.26 cusr  0.36 csys =  3.14 CPU)
Result: FAIL
Failed 1/24 test programs. 1/3133 subtests failed.
Makefile:844: recipe for target 'test_dynamic' failed
make[1]: *** [test_dynamic] Error 255
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
dh_auto_test: make -j1 test TEST_VERBOSE=1 returned exit code 2
debian/rules:7: recipe for target 'build-indep' failed
make: *** [build-indep] Error 2
dpkg-buildpackage: error: debian/rules build-indep gave error exit status 2
--------------------------------------------------------------------------------

The build was made on 2017-05-01 and the error says

expected: '2017-04-31'

which does not exist, as April has only 30 days.

This suggests a date-related bug.

I have not tried to reproduce it by building it again on May 1st.
Maybe this could be done by using libfaketime, but I think a better
strategy would be to look at the code and the error message and try to
guess how it may happen.

Thanks.