method

capture_io

v1_9_3_392 - Show latest stable - Class: MiniTest::Assertions

capture_io()

public

Captures $stdout and $stderr into strings:

out, err = capture_io do
  warn "You did a bad thing"
end

assert_match %r%bad%, err

# File lib/minitest/unit.rb, line 428
    def capture_io
      require 'stringio'

      orig_stdout, orig_stderr         = $stdout, $stderr
      captured_stdout, captured_stderr = StringIO.new, StringIO.new
      $stdout, $stderr                 = captured_stdout, captured_stderr

      yield

      return captured_stdout.string, captured_stderr.string
    ensure
      $stdout = orig_stdout
      $stderr = orig_stderr
    end

capture_io

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