[DRE-maint] Bug#926826: ruby-guard: FTBFS (failing tests)

[Santiago Vila]

Package: src:ruby-guard
Version: 2.15.0-2
Severity: serious
Tags: ftbfs

Dear maintainer:

I tried to build this package in buster but it failed:

--------------------------------------------------------------------------------
[...]
 debian/rules build-indep
dh build-indep --buildsystem=ruby --with ruby
   dh_update_autotools_config -i -O--buildsystem=ruby
   dh_autoreconf -i -O--buildsystem=ruby
   dh_auto_configure -i -O--buildsystem=ruby
	dh_ruby --configure
   dh_auto_build -i -O--buildsystem=ruby
	dh_ruby --build
   dh_ruby --build
   dh_auto_test -i -O--buildsystem=ruby
	dh_ruby --test
   create-stamp debian/debhelper-build-stamp
 fakeroot debian/rules binary-indep
dh binary-indep --buildsystem=ruby --with ruby

[... snipped ...]

    returns multiple plugin scopes
    returns a group scope

Guard::Deprecated::Watcher
  .match_guardfile?
    matches against current guardfile
    displays a deprecation warning to the user

Guard::Guardfile::Generator
  has a valid Guardfile template
  #initialize_template
    with an installed Guard implementation
      initializes the Guard
    with a user defined template
      copies the Guardfile template and initializes the Guard
    when the passed guard can't be found
      notifies the user about the problem
  #initialize_all_templates
    calls Guard.initialize_template on all installed plugins
  #create_guardfile
    with an existing Guardfile
      aborts
      displays an error message
      does not display information
      does not copy the Guardfile template or notify the user
    without an existing Guardfile
      copies the Guardfile template and notifies the user
      does not display any kind of error or abort

Guard::CLI
  #show
stub me: ENV[GEM_REQUIREMENT_IO-CONSOLE]!

Finished in 9.46 seconds (files took 1.48 seconds to load)
217 examples, 0 failures

Randomized with seed 39874

/usr/bin/ruby2.5 /usr/bin/rspec --pattern spec/\*\*\{,/\*/\*\*\}/\*_spec.rb -I spec -r spec_helper --no-fail-fast failed
ERROR: Test "ruby2.5" failed. Exiting.
dh_auto_install: dh_ruby --install /<<PKGBUILDDIR>>/debian/ruby-guard returned exit code 1
make[1]: *** [debian/rules:9: override_dh_auto_install] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:6: binary-indep] Error 2
dpkg-buildpackage: error: fakeroot debian/rules binary-indep subprocess returned exit status 2
--------------------------------------------------------------------------------

(The above is just how the build ends and not necessarily the most relevant part)

The build was made in my autobuilder with "dpkg-buildpackage -A"
and it also fails here:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/ruby-guard.html

where you can get a full build log if you need it.

If this is really a bug in one of the build-depends, please use reassign and affects,
so that this is still visible in the BTS web page for this package.

Thanks.