code: def test_qasm_3q():
      q = Qasm("qubit q0", "qubit q1", "qubit q2", "toffoli q2,q1,q0")
      assert q.get_circuit() == CGateS((0, 1), X(2))
  
file_path: sympy/sympy/physics/quantum/tests/test_qasm.py
imports: from sympy.physics.quantum.qasm import Qasm, flip_index, trim, get_index, nonblank, fullsplit, fixcommand, stripquotes, read_qasm
  from sympy.physics.quantum.gate import X, Z, H, S, T
  from sympy.physics.quantum.gate import CNOT, SWAP, CPHASE, CGate, CGateS
  from sympy.physics.quantum.circuitplot import Mz
label_desc: Use image node_id 8 for calling a global function with example usage: test_qasm_3q() without return types