Enforce dependency version in tests

.fixtures.yml

@@ -1,5 +1,7 @@
 fixtures:
   repositories:
-    "stdlib": "git://github.com/puppetlabs/puppetlabs-stdlib.git"
+    "stdlib":
+      "repo": "git://github.com/puppetlabs/puppetlabs-stdlib.git"
+      "ref": "v2.2.1"
   symlinks:
     "apt": "#{source_dir}"

spec/spec_helper_acceptance.rb

@@ -20,7 +20,7 @@ RSpec.configure do |c|
     puppet_module_install(:source => proj_root, :module_name => 'apt')
     hosts.each do |host|
       shell('/bin/touch /etc/puppet/hiera.yaml')
-      shell('puppet module install puppetlabs-stdlib', { :acceptable_exit_codes => [0,1] })
+      shell('puppet module install puppetlabs-stdlib --version 2.2.1', { :acceptable_exit_codes => [0,1] })
     end
   end
 end