Fix test coverage

Author: mhucka

src/openfermion/linalg/sparse_tools_test.py

@@ -1192,6 +1192,11 @@ def test_single_quad_two_mode(self):
         expected = numpy.kron(self.Id, self.p)
         self.assertTrue(numpy.allclose(res, expected))
 
+    def test_single_quad_op_sparse_invalid_quadrature(self):
+        """Test ValueError for invalid quadrature in single_quad_op_sparse."""
+        with self.assertRaisesRegex(ValueError, "Invalid value x for quadrature parameter."):
+            single_quad_op_sparse(n_modes=1, mode=0, quadrature='x', hbar=1.0, trunc=2)
+
     def test_boson_operator_sparse_trunc(self):
         op = BosonOperator('0')
         with self.assertRaises(ValueError):

src/openfermion/transforms/opconversions/jordan_wigner.py

@@ -294,8 +294,6 @@ def jordan_wigner_two_body(p, q, r, s, coefficient=1.0):
                 a, b = p, r
                 coefficient = -coefficient
             c = q
-        else:
-            raise RuntimeError('Invalid parameter combination.')
 
         # Get operators.
         parity_string = tuple((z, 'Z') for z in range(a + 1, b))

src/openfermion/transforms/opconversions/term_reordering_test.py

@@ -23,6 +23,7 @@
 
 from openfermion.transforms.opconversions.term_reordering import (
     normal_ordered,
+    normal_ordered_ladder_term,
     chemist_ordered,
     reorder,
 )
@@ -221,6 +222,22 @@ def test_exceptions(self):
         with self.assertRaises(TypeError):
             _ = normal_ordered(1)
 
+    def test_normal_ordered_ladder_term_invalid_parity(self):
+        term = ((0, 1), (1, 0))
+        coefficient = 1.0
+        invalid_parity_1 = 2
+        invalid_parity_2 = -2
+
+        with self.assertRaisesRegex(
+            ValueError, f"Invalid value {invalid_parity_1} for parity parameter"
+        ):
+            normal_ordered_ladder_term(term, coefficient, parity=invalid_parity_1)
+
+        with self.assertRaisesRegex(
+            ValueError, f"Invalid value {invalid_parity_2} for parity parameter"
+        ):
+            normal_ordered_ladder_term(term, coefficient, parity=invalid_parity_2)
+
 
 class TestReorder(unittest.TestCase):
     def test_reorder(self):