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Test coverage: add tests for ValueError in double_commutator #1264

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Test coverage: add tests for ValueError in double_commutator #1264

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e2fce4f
Add tests for ValueError in double_commutator
mhucka Apr 10, 2026
ca807b8
Merge branch 'main' into testing-improvement-double-commutator-183570…
mhucka Apr 10, 2026
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32 changes: 32 additions & 0 deletions src/openfermion/utils/commutators_test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,38 @@ def test_double_commtator_more_info_both_hopping(self):
com, (FermionOperator('4^ 3^ 4 2', 2.73) + FermionOperator('4^ 2^ 4 3', 2.73))
)

def test_double_commutator_hopping_no_intersection(self):
# Case where intersection is empty
op1 = FermionOperator('0^ 0')
op2 = FermionOperator('1^ 2') + FermionOperator('2^ 1')
op3 = FermionOperator('3^ 4') + FermionOperator('4^ 3')
res = double_commutator(
op1,
op2,
op3,
indices2={1, 2},
indices3={3, 4},
is_hopping_operator2=True,
is_hopping_operator3=True,
)
self.assertEqual(res, FermionOperator.zero())

def test_double_commutator_hopping_multi_intersection(self):
# Case where intersection has more than one element
op1 = FermionOperator('0^ 0')
op2 = FermionOperator('1^ 2') + FermionOperator('2^ 1')
op3 = FermionOperator('1^ 2') + FermionOperator('2^ 1')
res = double_commutator(
op1,
op2,
op3,
indices2={1, 2},
indices3={1, 2},
is_hopping_operator2=True,
is_hopping_operator3=True,
)
self.assertEqual(res, FermionOperator.zero())


class TriviallyDoubleCommutesDualBasisUsingTermInfoTest(unittest.TestCase):
def test_number_operators_trivially_commute(self):
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