How to pass options to rspec when run via autorun? Or, have rspec read from stdin?

[Robb Shecter]

I'd like to run RSpec with stdin instead of a file. And I want to control the formatter and other options. I'm finding this a little tricky, because:

• I don't see an RSpec CLI option for reading from stdin.
• Although RSpec can be run via ruby, ( $ cat example_spec.rb | ruby -rrspec/autorun ) I don't see how to pass options. I can only pass options via the standard configuration file lookup.

So: I can either use rspec, and set all the options I need but not read from stdin, or use ruby and read from stdin, but not be able to set options cleanly.

Is there a way to do this which I've missed? Thanks!

[Robb Shecter]

Ah hah, Ruby does support the - parameter, although it's not document in the -h output. Therefore, this works and satisfies my two requirements:

$ cat example_spec.rb | ruby -rrspec/autorun - --format json

I.e., I can run RSpec on standard input, while setting options.

[Myron Marston]

Thanks for letting us know what you figured out, Robb!

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[Robb Shecter]

On Sunday, March 20, 2016 at 7:50:16 PM UTC-7, Myron Marston wrote:

Thanks for letting us know what you figured out, Robb!

Sure, you're welcome. Could you tell me, if it's possible to do this purely using the rspec library; that is, without shelling out?

Here's my working code:

  def self.run_spec(source_code)
    stdin, stdout, stderr = Open3.popen3('ruby -rrspec/autorun - --format json')
    stdin.puts source_code
    stdin.close
    output = stdout.gets
    raise "Error running rspec: #{stderr.gets}" if output.nil?


    JSON.parse(output)
  end

 

[Robb Shecter]

I'm having problems using RSpec::Core::Runner.run within a Ruby instance because new invocations don't seem to pass the stream options fully through. E.g.:

BaseFormatter(#<File:/tmp/887763046.output>)

start(#<struct RSpec::Core::Notifications::StartNotification count=1, load_time=1.0752>), output is #<File:/tmp/887763046.output>

BaseFormatter(#<File:/tmp/3180149450.output>)

start(#<struct RSpec::Core::Notifications::StartNotification count=2, load_time=1.089341>), output is #<File:/tmp/887763046.output (closed)>

rake aborted!

IOError: closed stream

And that's after I've hacked a few places which do explicitly block changing the output stream after a first run.

[Robb Shecter]

I've succeeded in making it reentrant by this standard multi-threading technique of dup'ing these global objects:

      def initialize(options, configuration=RSpec.configuration, world=RSpec.world)                
        @options       = options.dup                                                                
        @configuration = configuration.dup                      
        @world         = world.dup
      end

Are you interested in this work toward reentrant-safety and thread-safety?