JSON resource's error message is missing filename when file is not found

[makotots]

Hello!

Description

In an example below, I expect filename is printed in its error message:

% inspec exec demo.rb
(snip)
  Json /nonexistent.json
     ↺  Can't find file ""    <---- here

% cat demo.rb
describe json('/nonexistent.json') do
  its('name') { should eq 'hello' }
end
%

InSpec and Platform Version

InSpec version : 1.7.1
Platform Version: macOS Sierra 10.12.1

Replication Case

See demo.rb above - run a test with a non-existent json filename.

Possible Solutions

According to resources/json.rb, the error message refers to @conf_path, which is undefined.

        @path = opts
        @file = inspec.file(@opts)
        @file_content = @file.content

        # check if file is available
        if !@file.file?
          skip_resource "Can't find file \"#{@conf_path}\""
          return @params = {}
        end

I believe the pull request #1345 is almost correct to handle this (successful unit test included in the PR) but I couldn't figure out why one of the functional test failed in Travis CI. I ran the same test using Travis CI several times, which did not reproduce the same test failure.

Stacktrace

No stacktrace is produced.

Thank you for your help in advance.

[chris-rock]

@makotots Great finding. Are you pushing up your PR again? I am happy to help with the unit tests.

[makotots]

@chris-rock Can you take a look at this PR (1363, not 1345) and help with the failed functional test? Thanks!