def subtest_cursor(self, query, iterable, expected_results):
self.assertRaises(ValueError, Cursor, None, None)
self.assertRaises(ValueError, Cursor, query, None)
self.assertRaises(ValueError, Cursor, None, iterable)
cursor = Cursor(query, iterable)
self.assertEqual(cursor.skipped, 0)
self.assertEqual(cursor.returned, 0)
cursor._ensure_modification_is_safe()
cursor.apply_filter()
cursor.apply_order()
cursor.apply_offset()
cursor.apply_limit()
cursor_results = []
for i in cursor:
self.assertRaises(AssertionError, cursor._ensure_modification_is_safe)
self.assertRaises(AssertionError, cursor.apply_filter)
self.assertRaises(AssertionError, cursor.apply_order)
self.assertRaises(AssertionError, cursor.apply_offset)
self.assertRaises(AssertionError, cursor.apply_limit)
cursor_results.append(i)
# ensure iteration happens only once.
self.assertRaises(RuntimeError, iter, cursor)
self.assertEqual(cursor_results, expected_results)
self.assertEqual(cursor.returned, len(expected_results))
self.assertEqual(cursor.skipped, query.offset)
if query.limit:
self.assertTrue(cursor.returned <= query.limit)
