fluent-plugin-parserにテスト追加中。 pattern not matchメッセージがとれない。。。標準出力、エラーではなく別の場所に出てるのかな。 pluginの中で、$log.warn で出してるところを取りたい。

gistfile1.rb

def capture_stderr(&block)
  original = $stderr
  captured = $stderr = StringIO.new

  begin
    yield
  ensure
    $stderr = original
  end

  captured.string
end

def capture_stdout(&block)
  original = $stdout
  captured = $stdout = StringIO.new

  begin
    yield
  ensure
    $stdout = original
  end

  captured.string
end

  CONFIG_UNMATCH_SILENTE_TRUE = %[
    type parser
    tag silent
    key_name      data
    format        /^cal1=(?<cal1>.+) cal2=(?<cal2>.+)$/
    unmatch_silent false
  ]
  def test_warning_unmatch_false
    matches_line   = "cal1=aaa cal2=bbb"
    unmatches_line = "ccc ddd"

    d = create_driver(CONFIG_UNMATCH_SILENTE_TRUE, 'test.in')
    
    result = capture_stderr{
      assert_nothing_raised {
          d.run do
            d.emit({'data' => matches_line}, Time.now.to_i)
            d.emit({'data' => unmatches_line}, Time.now.to_i)
          end
      }
    }

    result2 = capture_stderr{
      d.emit({'data' => unmatches_line}, Time.now.to_i)
    }

    # result, result2 are empty... expected 'pattern not match:...'
    # same capture_stdout
    
    emits = d.emits
    assert_equal 1, emits.length
    assert_equal 'aaa', emits[0][2]['cal1']
    assert_equal 'bbb', emits[0][2]['cal2']

  end