code: def testInvalidReservation(self):
      with self.assertRaises(ValueError):
          portspicker.pick_unused_ports(0)
  
file_path: pysc2/pysc2/lib/portspicker_test.py
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from pysc2.lib import portspicker
label_desc: Use image node_id 3 for calling the PortsTest obj's underlying member method code with example usage: obj.testInvalidReservation() without return types