`add_test': undefined method error on Ubuntu 15.10 with Ruby 2.1

[gregelin]

Description

Created simple example test.rb using code from README (see below). Ran inspec exec test.rb and received an error with stack trace when I expected to see the tests executed and results.

InSpec and Platform Version

Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily

Replication Case

1. Install Ruby, Ruby-Dev, InSpec on Ubuntu (see Install failed on Ubuntu with Ruby 2.1 #641)
2. Create simple test.rb using example from README
3. Run inspec exec test.rb

Possible Solutions

Tested similar steps on OS X and test.rb executed as expected. So we know syntax of test.rb OK.

Is Ruby version 2.1 a problem?

Stacktrace

root@kbs:~# mkdir inspec_test
root@kbs:~# cd inspec_test/
root@kbs:~/inspec_test# vi test.rb
root@kbs:~/inspec_test# inspec exec test.rb 
/var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner_rspec.rb:51:in `add_test': undefined method `register' for #<RSpec::Core::World:0x00000002c79e88> (NoMethodError)
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:183:in `block in register_rule'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:174:in `each'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:174:in `register_rule'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:104:in `block in add_content'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:103:in `each'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:103:in `add_content'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:68:in `add_profile'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/runner.rb:52:in `add_target'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/utils/base_cli.rb:69:in `block in run_tests'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/utils/base_cli.rb:69:in `each'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/utils/base_cli.rb:69:in `run_tests'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/lib/inspec/cli.rb:113:in `exec'
    from /var/lib/gems/2.1.0/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
    from /var/lib/gems/2.1.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
    from /var/lib/gems/2.1.0/gems/thor-0.19.1/lib/thor.rb:359:in `dispatch'
    from /var/lib/gems/2.1.0/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'
    from /var/lib/gems/2.1.0/gems/inspec-0.18.0/bin/inspec:9:in `<top (required)>'
    from /usr/local/bin/inspec:23:in `load'
    from /usr/local/bin/inspec:23:in `<main>'

root@kbs:~/inspec_test# cat test.rb 
describe package('telnetd') do
  it { should_not be_installed }
end

describe inetd_conf do
  its("telnet") { should eq nil }
end

[srenatus]

Hmm curious case. Thanks for reporting. Could you share the output of gem list rspec, please?

[mafr]

Same error here on Ubuntu 15.10 with ruby 2.1.5p273.

$ gem list rspec

*** LOCAL GEMS ***

rspec (3.5.0.beta3)
rspec-core (3.5.0.beta3)
rspec-expectations (3.5.0.beta3)
rspec-its (1.2.0)
rspec-mocks (3.5.0.beta3)
rspec-support (3.5.0.beta3)
$ 

[chris-rock]

I just tried this on a new ubuntu wily box (vagrant). I had no troubles installing inspec:

root@vagrant-ubuntu-wily-64:~# cat test.rb 
describe package('telnetd') do
  it { should_not be_installed }
end

describe inetd_conf do
  its("telnet") { should eq nil }
end
root@vagrant-ubuntu-wily-64:~# gem list rspec

*** LOCAL GEMS ***

rspec (3.3.0)
rspec-core (3.3.0)
rspec-expectations (3.3.0)
rspec-its (1.2.0)
rspec-mocks (3.3.0)
rspec-support (3.3.0)
serverspec (2.18.0)
root@vagrant-ubuntu-wily-64:~# ruby -v
ruby 2.1.5p273 (2014-11-13) [x86_64-linux-gnu]
root@vagrant-ubuntu-wily-64:~# inspec version
0.18.0
root@vagrant-ubuntu-wily-64:~# inspec exec test.rb 
..

Finished in 0.04281 seconds (files took 0.42523 seconds to load)
2 examples, 0 failures

Therefore its not a ruby 2.1 issue, since we tests this regularly.
@gregelin could you share your ruby and rspec versions?
@mafr How come that you have the rspec beta gems installed?

[mafr]

There was nothing Ruby-related on my machine and I was just following instructions :)

I end up with beta versions of rspec reliably - here's how to reproduce this in Docker:

$ docker run -ti ubuntu:15.10 /bin/bash
root@df713ab9e02d:/# apt-get update && apt-get install -y ruby ruby-dev gcc make
[...]
root@df713ab9e02d:/# gem install inspec
[...]
root@df713ab9e02d:/# cat > test.rb
describe package('telnetd') do
  it { should_not be_installed }
end

describe inetd_conf do
  its("telnet") { should eq nil }
end
root@df713ab9e02d:/# inspec exec test.rb
[ error as posted ]
root@df713ab9e02d:/# gem list rspec

*** LOCAL GEMS ***

rspec (3.5.0.beta3)
rspec-core (3.5.0.beta3)
rspec-expectations (3.5.0.beta3)
rspec-its (1.2.0)
rspec-mocks (3.5.0.beta3)
rspec-support (3.5.0.beta3)
root@df713ab9e02d:/#

When running "gem install rspec", I get version 3.4.0, but via "gem install inspec", I end up with the beta versions. Downgrading to rspec 3.4.0 fixes the problem, BTW.

[chris-rock]

In addition we also added support for our own docker container in #649