[DRE-maint] Bug#952039: ruby-graphviz: FTBFS: ERROR: Test "ruby2.7" failed: /<<PKGBUILDDIR>>/test/output/dot/hello_test.rb:18:in `<top (required)>': undefined method `graph' for nil:NilClass (NoMethodError)

[Lucas Nussbaum]

Source: ruby-graphviz
Version: 1.2.3-1
Severity: serious
Justification: FTBFS on amd64
Tags: buster sid
Usertags: ftbfs-20200222 ftbfs-buster

Hi,

During a rebuild of all packages in sid, your package failed to build
on amd64.

Relevant part (hopefully):
> /<<PKGBUILDDIR>>/test/output/dot/hello_test.rb:18:in `<top (required)>': undefined method `graph' for nil:NilClass (NoMethodError)
> 	from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require'
> 	from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_require.rb:92:in `require'
> 	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:17:in `block in <main>'
> 	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:5:in `select'
> 	from /usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb:5:in `<main>'
> rake aborted!
> Command failed with status (1): [ruby -w -I"test"  "/usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb" "test/output/dot/hello_test.rb" "test/output/dot/test_parse.rb" "test/output/rgv/test_rgv.rb" "test/test_dot_script.rb" "test/test_examples.rb" "test/test_graph.rb" "test/test_search.rb" "test/test_subgraph.rb" "test/test_theory.rb" "test/test_types.rb" "test/test_utils_colors.rb" -v]
> 
> Tasks: TOP => default
> (See full trace by running task with --trace)
> ERROR: Test "ruby2.7" failed: 

The full build log is available from:
   http://qa-logs.debian.net/2020/02/22/ruby-graphviz_1.2.3-1_unstable.log

A list of current common problems and possible solutions is available at
http://wiki.debian.org/qa.debian.org/FTBFS . You're welcome to contribute!

About the archive rebuild: The rebuild was done on EC2 VM instances from
Amazon Web Services, using a clean, minimal and up-to-date chroot. Every
failed build was retried once to eliminate random failures.