code: def test_fuzzy_not():
      assert fuzzy_not(T) == F
      assert fuzzy_not(F) == T
      assert fuzzy_not(U) == U
  
file_path: sympy/sympy/core/tests/test_logic.py
imports: from sympy.core.logic import fuzzy_not, Logic, And, Or, Not, fuzzy_and, fuzzy_or, _fuzzy_group, _torf, fuzzy_nand, fuzzy_xor
  from sympy.testing.pytest import raises
  from itertools import product
label_desc: Use image node_id 3 for calling a global function with example usage: test_fuzzy_not() without return types