new_contents: pytest_plugins = "pytester"
  
  
  def test_simple_example(testdir):
      """ Run the simple example code in a python subprocess and then compare its
          stderr to what we expect to see from it.  We run it in a subprocess to
          best capture its stderr. We expect to see match_lines in order in the
          output.  This test is just a sanity check to ensure that the progress
          bar progresses from 1 to 10, it does not make sure that the """
      v = testdir.makepyfile("""
          import time
          import progressbar
  
          bar = progressbar.ProgressBar()
          for i in bar(range(10)):
              time.sleep(0.1)
  
      """)
      result = testdir.runpython(v)
      result.stderr.re_match_lines([
          " 10% \(1 of 10\)",
          " 20% \(2 of 10\)",
          " 30% \(3 of 10\)",
          " 40% \(4 of 10\)",
          " 50% \(5 of 10\)",
          " 60% \(6 of 10\)",
          " 70% \(7 of 10\)",
          " 80% \(8 of 10\)",
          " 90% \(9 of 10\)",
          "100% \(10 of 10\)"
      ])
  
  
  def test_rapid_updates(testdir):
      """ Run some example code that updates 10 times, then sleeps .1 seconds,
          this is meant to test that the progressbar progresses normally with
          this sample code, since there were issues with it in the past """
      v = testdir.makepyfile("""
          import time
          import progressbar
  
          bar = progressbar.ProgressBar()
          for i in bar(range(100)):
              if i % 10 == 0:
                  time.sleep(0.1)
  
      """)
      result = testdir.runpython(v)
      result.stderr.re_match_lines([
          "  1% \(1 of 100\)",
          " 11% \(11 of 100\)",
          " 21% \(21 of 100\)",
          " 31% \(31 of 100\)",
          " 41% \(41 of 100\)",
          " 51% \(51 of 100\)",
          " 61% \(61 of 100\)",
          " 71% \(71 of 100\)",
          " 81% \(81 of 100\)",
          " 91% \(91 of 100\)",
          "100% \(100 of 100\)"
      ])
  
subject: Add New Test Which Monitors Output