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Add test to cover check_commutability #1081

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Add test to cover check_commutability #1081

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11afb64
Add test to cover check_commutability
mhucka Jun 5, 2026
1f15168
Merge branch 'master' into test-check-commutability
mhucka Jun 5, 2026
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25 changes: 25 additions & 0 deletions tensorflow_quantum/python/util_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -536,6 +536,31 @@ def test_get_circuit_symbols_error(self):
'cirq.Circuit'):
util.get_circuit_symbols(param)

def test_check_commutability(self):
"""Confirm that check_commutability works correctly."""
q0, q1 = cirq.GridQubit.rect(1, 2)

# Commutable terms
pauli_sum = cirq.X(q0) + cirq.X(q1)
util.check_commutability(pauli_sum)

pauli_sum = cirq.X(q0) * cirq.Z(q1) + cirq.Z(q0) * cirq.X(q1)
util.check_commutability(pauli_sum)

# Non-commutable terms
pauli_sum = cirq.X(q0) + cirq.Z(q0)
with self.assertRaisesRegex(ValueError,
expected_regex='non-commutable'):
util.check_commutability(pauli_sum)

# Single term
pauli_sum = cirq.PauliSum.from_pauli_strings([cirq.X(q0)])
util.check_commutability(pauli_sum)

# Empty PauliSum
pauli_sum = cirq.PauliSum()
util.check_commutability(pauli_sum)


class ExponentialUtilFunctionsTest(tf.test.TestCase):
"""Test that Exponential utility functions work."""
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