method

capture_io

v2_1_10 - Show latest stable - 0 notes - Class: Assertions

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What's this?

capture_io() public

Captures $stdout and $stderr into strings:

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

assert_match %r%info%, out
assert_match %r%bad%, err

NOTE: For efficiency, this method uses StringIO and does not capture IO for subprocesses. Use #capture_subprocess_io for that.

Show source

# File lib/minitest/unit.rb, line 468
    def capture_io
      require 'stringio'

      captured_stdout, captured_stderr = StringIO.new, StringIO.new

      synchronize do
        orig_stdout, orig_stderr = $stdout, $stderr
        $stdout, $stderr         = captured_stdout, captured_stderr

        begin
          yield
        ensure
          $stdout = orig_stdout
          $stderr = orig_stderr
        end
      end

      return captured_stdout.string, captured_stderr.string
    end

capture_io

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