@yasuyk Oh, I am sorry for this.  Puppet provisioning is a little hard to setup currently.  Don't mind, and just ignore the testing VM for now.  I'll try to simplify the setup to work out of the box with just standard Vagrant and VirtualBox.

I presume, you tested on Ruby 2.  With Ruby 2.0, the test passes.  With Ruby 1.9.3 however, I get the following test failure for `cask exec ert-runner -p yaml`:

```
[…]
Test checker-yaml-ruby-psych-syntax-error condition:
    (ert-test-failed
     ((should
       (-contains\? flycheck-current-errors real-error))
      :form
      (-contains\?
       ([cl-struct-flycheck-error #<killed buffer> yaml-ruby "/flycheck/test/resources/checkers/yaml-syntax-error.yaml" 3 4 "couldn't parse YAML" error])
       [cl-struct-flycheck-error #<killed buffer> yaml-ruby "/flycheck/test/resources/checkers/yaml-syntax-error.yaml" 4 5 "mapping values are not allowed in this context" error])
      :value nil))
   FAILED  1/2  checker-yaml-ruby-psych-syntax-error
   failed  2/2  checker-yaml-ruby-syck-syntax-error
```

I have omitted the stacktrace, since it is irrelevant for this problem.  I presume, that the exception message just changed between 1.9.3 and 2.0.  I think, it would be sufficient to just use a little `if` expression to change the expected error accordingly.

Just leave things as they are, I'll can easily the test case myself, now that I know the actual culprit.

Thank you!