def test_empty_dag(self):
""" Empty DAG has 0 depth """
circuit = QuantumCircuit()
dag = circuit_to_dag(circuit)
pass_ = Width()
_ = pass_.run(dag)
self.assertEqual(pass_.property_set['width'], 0)
def test_just_qubits(self):
""" A dag with 8 operations and no classic bits"""
qr = QuantumRegister(2)
circuit = QuantumCircuit(qr)
circuit.h(qr[0])
circuit.h(qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[0], qr[1])
circuit.cx(qr[1], qr[0])
circuit.cx(qr[1], qr[0])
dag = circuit_to_dag(circuit)
pass_ = Width()
_ = pass_.run(dag)
self.assertEqual(pass_.property_set['width'], 2)