diff --git a/tests/test_nontree_vit_haploid.py b/tests/test_nontree_vit_haploid.py
index d681a0c..3560c78 100644
--- a/tests/test_nontree_vit_haploid.py
+++ b/tests/test_nontree_vit_haploid.py
@@ -152,7 +152,16 @@ def verify(self, ts, scale_mutation_rate, include_ancestors):
                 emission_func=emission_func,
             )
             path_tmp = vh.backwards_viterbi_hap(m=m, V_last=V_tmp, P=P_tmp)
-            ll_check = vh.path_ll_hap(n=n, m=m, H=H_vs, path=path_tmp, s=s, e=e_vs, r=r, emission_func=emission_func,)
+            ll_check = vh.path_ll_hap(
+                n=n,
+                m=m,
+                H=H_vs,
+                path=path_tmp,
+                s=s,
+                e=e_vs,
+                r=r,
+                emission_func=emission_func,
+            )
             self.assertAllClose(ll_tmp, ll_check)
             self.assertAllClose(ll_vs, ll_tmp)