text: Title: Add tests for checking color of spinner in stdout
  Body: <!-- Please use the appropriate issue title format:
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  ## Description
  
  Currently tests run on cleaned `stdout` with no ansi escapings. Actual color in output is not tested. This issue aims to track and fix it.
  
  See https://github.com/manrajgrover/halo/pull/78#pullrequestreview-155713163 for more information.
  
  ## People to notify
  <!-- Please @mention relevant people here:-->
  @manrajgrover
  