def test_err(self):
r = ManualReadable([23])
e = Exception()
errs = []
d = r.read()
d.addErrback(lambda f: errs.append(f.value))
yield r.err(e)
self.assertEqual(errs, [e])
def test_reading(self):
r = ManualReadable([1, 2, 3, 4])
self.assertEqual(r.unread, [1, 2, 3, 4])
self.assertEqual(r.reading, [])
d1 = r.read()
self.assertEqual(r.unread, [2, 3, 4])
self.assertEqual(r.reading, [1])
d2 = r.read()
self.assertEqual(r.unread, [3, 4])
self.assertEqual(r.reading, [1, 2])
self.assertEqual(d1, r.next())
self.assertEqual((yield d1), 1)
self.assertEqual(r.unread, [3, 4])
self.assertEqual(r.reading, [2])
self.assertEqual(d2, r.next())
self.assertEqual((yield d2), 2)
self.assertEqual(r.unread, [3, 4])
self.assertEqual(r.reading, [])
d = r.read()
self.assertEqual(r.unread, [4])
self.assertEqual(r.reading, [3])
self.assertEqual(d, r.next())
self.assertEqual((yield d), 3)
d = r.read()
self.assertEqual(r.unread, [])
self.assertEqual(r.reading, [4])
self.assertEqual(d, r.next())
self.assertEqual((yield d), 4)
self.assertEqual((yield r.read()), None)
self.assertEqual((yield r.read()), None)