class LeapTest

  #
  # works like pgrep command line
  # return an array of hashes like so [{:pid => "1234", :process => "ls"}]
  #
  def pgrep(match)
    output = `pgrep --full --list-name '#{match}'`
    output.each_line.map{|line|
      pid = line.split(' ')[0]
      process = line.gsub(/(#{pid} |\n)/, '')
      # filter out pgrep cmd itself
      # on wheezy hosts, the "process" var contains the whole cmd including all parameters
      # on jessie hosts, it only contains the first cmd (which is the default sheel invoked by 'sh')
      if process =~ /^sh/
        nil
      else
        {:pid => pid, :process => process}
      end
    }.compact
  end

  def assert_running(process, options={})
    processes = pgrep(process)
    assert processes.any?, "No running process for #{process}"
    if options[:single]
      assert processes.length == 1, "More than one process for #{process}"
    end
  end

  #
  # runs the specified command, failing on a non-zero exit status.
  #
  def assert_run(command)
    output = `#{command}`
    if $?.exitstatus != 0
      fail "Error running `#{command}`:\n#{output}"
    end
  end

end