def test_err(self):
w = ManualWritable()
e = Exception()
errs = []
d = w.write(23)
d.addErrback(lambda f: errs.append(f.value))
yield w.err(e)
self.assertEqual(errs, [e])
def test_writing(self):
w = ManualWritable()
self.assertEqual(w.writing, [])
self.assertEqual(w.written, [])
d1 = w.write(1)
self.assertEqual(w.writing, [1])
self.assertEqual(w.written, [])
d2 = w.write(2)
self.assertEqual(w.writing, [1, 2])
self.assertEqual(w.written, [])
self.assertEqual(d1, w.next())
yield d1
self.assertEqual(w.writing, [2])
self.assertEqual(w.written, [1])
self.assertEqual(d2, w.next())
yield d2
self.assertEqual(w.writing, [])
self.assertEqual(w.written, [1, 2])
d = w.write(3)
self.assertEqual(w.writing, [3])
self.assertEqual(w.written, [1, 2])
self.assertEqual(d, w.next())
yield d
self.assertEqual(w.writing, [])
self.assertEqual(w.written, [1, 2, 3])
d = w.write(4)
self.assertEqual(w.writing, [4])
self.assertEqual(w.written, [1, 2, 3])
self.assertEqual(d, w.next())
yield d
self.assertEqual(w.writing, [])
self.assertEqual(w.written, [1, 2, 3, 4])
