text: import io
  import unittest
  
  
  class TestFileBasedBuffer(unittest.TestCase):
      def _makeOne(self, file=None, from_buffer=None):
          from waitress.buffers import FileBasedBuffer
  
          buf = FileBasedBuffer(file, from_buffer=from_buffer)
          self.buffers_to_close.append(buf)
          return buf
  
      def setUp(self):
          self.buffers_to_close = []
  
      def tearDown(self):
          for buf in self.buffers_to_close:
              buf.close()
  
      def test_ctor_from_buffer_None(self):
          inst = self._makeOne("file")
          self.assertEqual(inst.file, "file")
  
      def test_ctor_from_buffer(self):
          from_buffer = io.BytesIO(b"data")
          from_buffer.getfile = lambda *x: from_buffer
          f = io.BytesIO()
          inst = self._makeOne(f, from_buffer)
          self.assertEqual(inst.file, f)
          del from_buffer.getfile
          self.assertEqual(inst.remain, 4)
          from_buffer.close()
  
      def test___len__(self):
          inst = self._makeOne()
          inst.remain = 10
          self.assertEqual(len(inst), 10)
  
      def test___nonzero__(self):
          inst = self._makeOne()
          inst.remain = 10
          self.assertEqual(bool(inst), True)
          inst.remain = 0
          self.assertEqual(bool(inst), True)
  
      def test_append(self):
          f = io.BytesIO(b"data")
          inst = self._makeOne(f)
          inst.append(b"data2")
          self.assertEqual(f.getvalue(), b"datadata2")
          self.assertEqual(inst.remain, 5)
  
      def test_get_skip_true(self):
          f = io.BytesIO(b"data")
          inst = self._makeOne(f)
          result = inst.get(100, skip=True)
          self.assertEqual(result, b"data")
          self.assertEqual(inst.remain, -4)
  
      def test_get_skip_false(self):
          f = io.BytesIO(b"data")
          inst = self._makeOne(f)
          result = inst.get(100, skip=False)
          self.assertEqual(result, b"data")
          self.assertEqual(inst.remain, 0)
  
      def test_get_skip_bytes_less_than_zero(self):
          f = io.BytesIO(b"data")
          inst = self._makeOne(f)
          result = inst.get(-1, skip=False)
          self.assertEqual(result, b"data")
          self.assertEqual(inst.remain, 0)
  
      def test_skip_remain_gt_bytes(self):
          f = io.BytesIO(b"d")
          inst = self._makeOne(f)
          inst.remain = 1
          inst.skip(1)
          self.assertEqual(inst.remain, 0)
  
      def test_skip_remain_lt_bytes(self):
          f = io.BytesIO(b"d")
          inst = self._makeOne(f)
          inst.remain = 1
          self.assertRaises(ValueError, inst.skip, 2)
  
      def test_newfile(self):
          inst = self._makeOne()
          self.assertRaises(NotImplementedError, inst.newfile)
  
      def test_prune_remain_notzero(self):
          f = io.BytesIO(b"d")
          inst = self._makeOne(f)
          inst.remain = 1
          nf = io.BytesIO()
          inst.newfile = lambda *x: nf
          inst.prune()
          self.assertTrue(inst.file is not f)
          self.assertEqual(nf.getvalue(), b"d")
  
      def test_prune_remain_zero_tell_notzero(self):
          f = io.BytesIO(b"d")
          inst = self._makeOne(f)
          nf = io.BytesIO(b"d")
          inst.newfile = lambda *x: nf
          inst.remain = 0
          inst.prune()
          self.assertTrue(inst.file is not f)
          self.assertEqual(nf.getvalue(), b"d")
  
      def test_prune_remain_zero_tell_zero(self):
          f = io.BytesIO()
          inst = self._makeOne(f)
          inst.remain = 0
          inst.prune()
          self.assertTrue(inst.file is f)
  
      def test_close(self):
          f = io.BytesIO()
          inst = self._makeOne(f)
          inst.close()
          self.assertTrue(f.closed)
          self.buffers_to_close.remove(inst)
  
  
  class TestTempfileBasedBuffer(unittest.TestCase):
      def _makeOne(self, from_buffer=None):
          from waitress.buffers import TempfileBasedBuffer
  
          buf = TempfileBasedBuffer(from_buffer=from_buffer)
          self.buffers_to_close.append(buf)
          return buf
  
      def setUp(self):
          self.buffers_to_close = []
  
      def tearDown(self):
          for buf in self.buffers_to_close:
              buf.close()
  
      def test_newfile(self):
          inst = self._makeOne()
          r = inst.newfile()
          self.assertTrue(hasattr(r, "fileno"))  # file
          r.close()
  
  
  class TestBytesIOBasedBuffer(unittest.TestCase):
      def _makeOne(self, from_buffer=None):
          from waitress.buffers import BytesIOBasedBuffer
  
          return BytesIOBasedBuffer(from_buffer=from_buffer)
  
      def test_ctor_from_buffer_not_None(self):
          f = io.BytesIO()
          f.getfile = lambda *x: f
          inst = self._makeOne(f)
          self.assertTrue(hasattr(inst.file, "read"))
  
      def test_ctor_from_buffer_None(self):
          inst = self._makeOne()
          self.assertTrue(hasattr(inst.file, "read"))
  
      def test_newfile(self):
          inst = self._makeOne()
          r = inst.newfile()
          self.assertTrue(hasattr(r, "read"))
  
  
  class TestReadOnlyFileBasedBuffer(unittest.TestCase):
      def _makeOne(self, file, block_size=8192):
          from waitress.buffers import ReadOnlyFileBasedBuffer
  
          buf = ReadOnlyFileBasedBuffer(file, block_size)
          self.buffers_to_close.append(buf)
          return buf
  
      def setUp(self):
          self.buffers_to_close = []
  
      def tearDown(self):
          for buf in self.buffers_to_close:
              buf.close()
  
      def test_prepare_not_seekable(self):
          f = KindaFilelike(b"abc")
          inst = self._makeOne(f)
          result = inst.prepare()
          self.assertEqual(result, False)
          self.assertEqual(inst.remain, 0)
  
      def test_prepare_not_seekable_closeable(self):
          f = KindaFilelike(b"abc", close=1)
          inst = self._makeOne(f)
          result = inst.prepare()
          self.assertEqual(result, False)
          self.assertEqual(inst.remain, 0)
          self.assertTrue(hasattr(inst, "close"))
  
      def test_prepare_seekable_closeable(self):
          f = Filelike(b"abc", close=1, tellresults=[0, 10])
          inst = self._makeOne(f)
          result = inst.prepare()
          self.assertEqual(result, 10)
          self.assertEqual(inst.remain, 10)
          self.assertEqual(inst.file.seeked, 0)
          self.assertTrue(hasattr(inst, "close"))
  
      def test_get_numbytes_neg_one(self):
          f = io.BytesIO(b"abcdef")
          inst = self._makeOne(f)
          inst.remain = 2
          result = inst.get(-1)
          self.assertEqual(result, b"ab")
          self.assertEqual(inst.remain, 2)
          self.assertEqual(f.tell(), 0)
  
      def test_get_numbytes_gt_remain(self):
          f = io.BytesIO(b"abcdef")
          inst = self._makeOne(f)
          inst.remain = 2
          result = inst.get(3)
          self.assertEqual(result, b"ab")
          self.assertEqual(inst.remain, 2)
          self.assertEqual(f.tell(), 0)
  
      def test_get_numbytes_lt_remain(self):
          f = io.BytesIO(b"abcdef")
          inst = self._makeOne(f)
          inst.remain = 2
          result = inst.get(1)
          self.assertEqual(result, b"a")
          self.assertEqual(inst.remain, 2)
          self.assertEqual(f.tell(), 0)
  
      def test_get_numbytes_gt_remain_withskip(self):
          f = io.BytesIO(b"abcdef")
          inst = self._makeOne(f)
          inst.remain = 2
          result = inst.get(3, skip=True)
          self.assertEqual(result, b"ab")
          self.assertEqual(inst.remain, 0)
          self.assertEqual(f.tell(), 2)
  
      def test_get_numbytes_lt_remain_withskip(self):
          f = io.BytesIO(b"abcdef")
          inst = self._makeOne(f)
          inst.remain = 2
          result = inst.get(1, skip=True)
          self.assertEqual(result, b"a")
          self.assertEqual(inst.remain, 1)
          self.assertEqual(f.tell(), 1)
  
      def test___iter__(self):
          data = b"a" * 10000
          f = io.BytesIO(data)
          inst = self._makeOne(f)
          r = b""
          for val in inst:
              r += val
          self.assertEqual(r, data)
  
      def test_append(self):
          inst = self._makeOne(None)
          self.assertRaises(NotImplementedError, inst.append, "a")
  
  
  class TestOverflowableBuffer(unittest.TestCase):
      def _makeOne(self, overflow=10):
          from waitress.buffers import OverflowableBuffer
  
          buf = OverflowableBuffer(overflow)
          self.buffers_to_close.append(buf)
          return buf
  
      def setUp(self):
          self.buffers_to_close = []
  
      def tearDown(self):
          for buf in self.buffers_to_close:
              buf.close()
  
      def test___len__buf_is_None(self):
          inst = self._makeOne()
          self.assertEqual(len(inst), 0)
  
      def test___len__buf_is_not_None(self):
          inst = self._makeOne()
          inst.buf = b"abc"
          self.assertEqual(len(inst), 3)
          self.buffers_to_close.remove(inst)
  
      def test___nonzero__(self):
          inst = self._makeOne()
          inst.buf = b"abc"
          self.assertEqual(bool(inst), True)
          inst.buf = b""
          self.assertEqual(bool(inst), False)
          self.buffers_to_close.remove(inst)
  
      def test___nonzero___on_int_overflow_buffer(self):
          inst = self._makeOne()
  
          class int_overflow_buf(bytes):
              def __len__(self):
                  # maxint + 1
                  return 0x7FFFFFFFFFFFFFFF + 1
  
          inst.buf = int_overflow_buf()
          self.assertEqual(bool(inst), True)
          inst.buf = b""
          self.assertEqual(bool(inst), False)
          self.buffers_to_close.remove(inst)
  
      def test__create_buffer_large(self):
          from waitress.buffers import TempfileBasedBuffer
  
          inst = self._makeOne()
          inst.strbuf = b"x" * 11
          inst._create_buffer()
          self.assertEqual(inst.buf.__class__, TempfileBasedBuffer)
          self.assertEqual(inst.buf.get(100), b"x" * 11)
          self.assertEqual(inst.strbuf, b"")
  
      def test__create_buffer_small(self):
          from waitress.buffers import BytesIOBasedBuffer
  
          inst = self._makeOne()
          inst.strbuf = b"x" * 5
          inst._create_buffer()
          self.assertEqual(inst.buf.__class__, BytesIOBasedBuffer)
          self.assertEqual(inst.buf.get(100), b"x" * 5)
          self.assertEqual(inst.strbuf, b"")
  
      def test_append_with_len_more_than_max_int(self):
          from waitress.compat import MAXINT
  
          inst = self._makeOne()
          inst.overflowed = True
          buf = DummyBuffer(length=MAXINT)
          inst.buf = buf
          result = inst.append(b"x")
          # we don't want this to throw an OverflowError on Python 2 (see
          # https://github.com/Pylons/waitress/issues/47)
          self.assertEqual(result, None)
          self.buffers_to_close.remove(inst)
  
      def test_append_buf_None_not_longer_than_srtbuf_limit(self):
          inst = self._makeOne()
          inst.strbuf = b"x" * 5
          inst.append(b"hello")
          self.assertEqual(inst.strbuf, b"xxxxxhello")
  
      def test_append_buf_None_longer_than_strbuf_limit(self):
          inst = self._makeOne(10000)
          inst.strbuf = b"x" * 8192
          inst.append(b"hello")
          self.assertEqual(inst.strbuf, b"")
          self.assertEqual(len(inst.buf), 8197)
  
      def test_append_overflow(self):
          inst = self._makeOne(10)
          inst.strbuf = b"x" * 8192
          inst.append(b"hello")
          self.assertEqual(inst.strbuf, b"")
          self.assertEqual(len(inst.buf), 8197)
  
      def test_append_sz_gt_overflow(self):
          from waitress.buffers import BytesIOBasedBuffer
  
          f = io.BytesIO(b"data")
          inst = self._makeOne(f)
          buf = BytesIOBasedBuffer()
          inst.buf = buf
          inst.overflow = 2
          inst.append(b"data2")
          self.assertEqual(f.getvalue(), b"data")
          self.assertTrue(inst.overflowed)
          self.assertNotEqual(inst.buf, buf)
  
      def test_get_buf_None_skip_False(self):
          inst = self._makeOne()
          inst.strbuf = b"x" * 5
          r = inst.get(5)
          self.assertEqual(r, b"xxxxx")
  
      def test_get_buf_None_skip_True(self):
          inst = self._makeOne()
          inst.strbuf = b"x" * 5
          r = inst.get(5, skip=True)
          self.assertFalse(inst.buf is None)
          self.assertEqual(r, b"xxxxx")
  
      def test_skip_buf_None(self):
          inst = self._makeOne()
          inst.strbuf = b"data"
          inst.skip(4)
          self.assertEqual(inst.strbuf, b"")
          self.assertNotEqual(inst.buf, None)
  
      def test_skip_buf_None_allow_prune_True(self):
          inst = self._makeOne()
          inst.strbuf = b"data"
          inst.skip(4, True)
          self.assertEqual(inst.strbuf, b"")
          self.assertEqual(inst.buf, None)
  
      def test_prune_buf_None(self):
          inst = self._makeOne()
          inst.prune()
          self.assertEqual(inst.strbuf, b"")
  
      def test_prune_with_buf(self):
          inst = self._makeOne()
  
          class Buf:
              def prune(self):
                  self.pruned = True
  
          inst.buf = Buf()
          inst.prune()
          self.assertEqual(inst.buf.pruned, True)
          self.buffers_to_close.remove(inst)
  
      def test_prune_with_buf_overflow(self):
          inst = self._makeOne()
  
          class DummyBuffer(io.BytesIO):
              def getfile(self):
                  return self
  
              def prune(self):
                  return True
  
              def __len__(self):
                  return 5
  
              def close(self):
                  pass
  
          buf = DummyBuffer(b"data")
          inst.buf = buf
          inst.overflowed = True
          inst.overflow = 10
          inst.prune()
          self.assertNotEqual(inst.buf, buf)
  
      def test_prune_with_buflen_more_than_max_int(self):
          from waitress.compat import MAXINT
  
          inst = self._makeOne()
          inst.overflowed = True
          buf = DummyBuffer(length=MAXINT + 1)
          inst.buf = buf
          result = inst.prune()
          # we don't want this to throw an OverflowError on Python 2 (see
          # https://github.com/Pylons/waitress/issues/47)
          self.assertEqual(result, None)
  
      def test_getfile_buf_None(self):
          inst = self._makeOne()
          f = inst.getfile()
          self.assertTrue(hasattr(f, "read"))
  
      def test_getfile_buf_not_None(self):
          inst = self._makeOne()
          buf = io.BytesIO()
          buf.getfile = lambda *x: buf
          inst.buf = buf
          f = inst.getfile()
          self.assertEqual(f, buf)
  
      def test_close_nobuf(self):
          inst = self._makeOne()
          inst.buf = None
          self.assertEqual(inst.close(), None)  # doesnt raise
          self.buffers_to_close.remove(inst)
  
      def test_close_withbuf(self):
          class Buffer:
              def close(self):
                  self.closed = True
  
          buf = Buffer()
          inst = self._makeOne()
          inst.buf = buf
          inst.close()
          self.assertTrue(buf.closed)
          self.buffers_to_close.remove(inst)
  
  
  class KindaFilelike:
      def __init__(self, bytes, close=None, tellresults=None):
          self.bytes = bytes
          self.tellresults = tellresults
          if close is not None:
              self.close = lambda: close
  
  
  class Filelike(KindaFilelike):
      def seek(self, v, whence=0):
          self.seeked = v
  
      def tell(self):
          v = self.tellresults.pop(0)
          return v
  
  
  class DummyBuffer:
      def __init__(self, length=0):
          self.length = length
  
      def __len__(self):
          return self.length
  
      def append(self, s):
          self.length = self.length + len(s)
  
      def prune(self):
          pass
  
      def close(self):
          pass
  