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Add unit tests for TFQPauliSumCollector.collect #1015

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7bce77c
🧪 Add unit tests for TFQPauliSumCollector.collect
mhucka Mar 13, 2026
e98571f
Refactor code to simplify and make extendable
mhucka Mar 13, 2026
4653e61
Incorporate suggestion from Gemini Code Assist
mhucka Mar 16, 2026
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22 changes: 22 additions & 0 deletions tensorflow_quantum/core/ops/batch_util_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -308,6 +308,28 @@ def test_no_circuit(self, sim):
self.assertDTypeEqual(results, np.int8)
self.assertEqual(np.zeros(shape=(0, 0, 0)).shape, results.shape)

def test_pauli_sum_collector_collect(self):
"""Test the collect method of TFQPauliSumCollector."""
qubit = cirq.GridQubit(0, 0)
circuit = cirq.Circuit(cirq.X(qubit))
samples_per_term = 100
sampler = cirq.Simulator()

test_cases = [
("Pauli observable (Z)", cirq.PauliSum.wrap(cirq.Z(qubit)), -1.0),
("Identity observable", cirq.PauliSum.wrap(cirq.I(qubit)), 1.0),
("Mixed observable (Z + 2.0*I)",
cirq.Z(qubit) + 2.0 * cirq.I(qubit), 1.0),
]

for name, observable, expected_energy in test_cases:
with self.subTest(name):
collector = batch_util.TFQPauliSumCollector(
circuit, observable, samples_per_term=samples_per_term)
collector.collect(sampler)
self.assertAlmostEqual(collector.estimated_energy(),
expected_energy)


if __name__ == '__main__':
tf.test.main()
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