code: def test_commutator():
      c = Comm(A, B)
      assert c.is_commutative is False
      assert isinstance(c, Comm)
      assert c.subs(A, C) == Comm(C, B)
  
file_path: sympy/sympy/physics/quantum/tests/test_commutator.py
imports: from sympy.core.numbers import Integer
  from sympy.core.symbol import symbols
  from sympy.physics.quantum.dagger import Dagger
  from sympy.physics.quantum.commutator import Commutator
  from sympy.physics.quantum.operator import Operator
label_desc: Use image node_id 1 for calling a global function with example usage: test_commutator() without return types