def METHOD_NAME(self):
    self.reader.feed_data(b"spam")
    self.reader.feed_data(b"eggs")
    gen = self.reader.read_exact(8)
    data = self.assertGeneratorReturns(gen)
    self.assertEqual(data, b"spameggs")
    gen = self.reader.at_eof()
    self.assertGeneratorRunning(gen)