894             read1 = read  variable in IOTest.test_buffered_readinto_mixin.Stream
948             def read1(self, size):  member in IOTest.test_BufferedIOBase_readinto.Reader
1257         self.assertEqual(b"b", bufio.read1(1))
1259         self.assertEqual(b"", bufio.read1(0))
1260         self.assertEqual(b"c", bufio.read1(100))
1262         self.assertEqual(b"d", bufio.read1(100))
1264         self.assertEqual(b"efg", bufio.read1(100))
1266         self.assertEqual(b"", bufio.read1(100))
1273         self.assertEqual(b"bc", bufio.read1())
1274         self.assertEqual(b"d", bufio.read1())
1275         self.assertEqual(b"efg", bufio.read1(-1))
1277         self.assertEqual(b"", bufio.read1())
1501         self.assertRaises(ValueError, b.read1, 1)
1963         self.assertEqual(pair.read1(3), b"abc")
1964         self.assertEqual(pair.read1(), b"def")
2218             bufio.read1(1)
2292                 self.assertEqual(f.read1(1), b'd')
3592     def read1(self, len_):  member in MemviewBytesIO
3593         return _to_memoryview(super().read1(len_))
3861                 self.assertRaises(ValueError, f.read1, 1024)
3862                 self.assertRaises(ValueError, f.read1)