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random programming notes

Suppress Stdout and Stderr When Running RSpec

Sometimes code prints to stdout, stderr. Corresponding RSpec examples print the same output, which could be messy. To suppress the output:

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def silence
  # Store the original stderr and stdout in order to restore them later
  @original_stderr = $stderr
  @original_stdout = $stdout

  # Redirect stderr and stdout
  $stderr = $stdout = StringIO.new

  yield

  $stderr = @original_stderr
  $stdout = @original_stdout
  @original_stderr = nil
  @original_stdout = nil
end

it "suppresses output" do
  silence do
      # whatever code to test 
  end
end