code: def test_identify_fans_exceptions(self):
      with self.assertRaisesRegexp(ValueError, "shape is unknown"):
          identify_fans(tuple())
  
imports: import math
  from scipy import stats
  import numpy
  from neupy import init
  from neupy.init import identify_fans
  from base import BaseTestCase
label_desc: Use image node_id 3 for calling the FanIdentifierTestCase obj's underlying member method code with example usage: obj.test_identify_fans_exceptions() without return types