style: canonicalize black formatting on test files

tests/quality/test_neutrino_mass_cli.py

@@ -56,9 +56,9 @@ class TestNeutrinoMassPhaseSpace:
         val_massive = ps_massive(W_near_endpoint)[0]
 
         assert not np.isnan(val_massive), "Should produce finite value"
-        assert val_massive < val_zero, (
-            "Massive neutrino must suppress spectrum near endpoint"
-        )
+        assert (
+            val_massive < val_zero
+        ), "Massive neutrino must suppress spectrum near endpoint"
 
 
 class TestCLIArguments:
@@ -84,6 +84,6 @@ class TestCLIArguments:
         parser = _build_parser()
 
         args = parser.parse_args(["--nuclide", "Tc99"])
-        assert args.neutrino_mass is None, (
-            "unset --neutrino-mass must parse as None (not a value)"
-        )
+        assert (
+            args.neutrino_mass is None
+        ), "unset --neutrino-mass must parse as None (not a value)"