code: def testEmptyIntersection(self):
      values, ix1, ix2 = collections.intersect([1, 2, 3], [4, 5, 6])
      self.assertEqual(len(values), 0)
      self.assertEqual(len(ix1), 0)
      self.assertEqual(len(ix2), 0)
  
      values, ix1, ix2 = collections.intersect([], [])
      self.assertEqual(len(values), 0)
      self.assertEqual(len(ix1), 0)
      self.assertEqual(len(ix2), 0)
  
imports: import datetime
  from six.moves import xrange
  from .None import common
  from pyalgotrade import utils
  from pyalgotrade.utils import collections
  from pyalgotrade.utils import dt
label_desc: Use image node_id 1 for calling the IntersectTestCase obj's underlying member method code with example usage: obj.testEmptyIntersection() without return types