diff --git a/tests/test_api_fb_haploid_multi.py b/tests/test_api_fb_haploid_multi.py
index 34858b0..a90f57a 100644
--- a/tests/test_api_fb_haploid_multi.py
+++ b/tests/test_api_fb_haploid_multi.py
@@ -66,6 +66,8 @@ def test_ts_multiallelic_n10_no_recomb(
     @pytest.mark.parametrize("num_samples", [6, 8, 16])
     @pytest.mark.parametrize("scale_mutation_rate", [True, False])
     @pytest.mark.parametrize("include_ancestors", [True, False])
-    def test_ts_multiallelic_n16(self, num_samples, scale_mutation_rate, include_ancestors):
+    def test_ts_multiallelic_n16(
+        self, num_samples, scale_mutation_rate, include_ancestors
+    ):
         ts = self.get_ts_multiallelic(num_samples)
         self.verify(ts, scale_mutation_rate, include_ancestors)
diff --git a/tests/test_api_vit_haploid_multi.py b/tests/test_api_vit_haploid_multi.py
index 4a55f14..5020171 100644
--- a/tests/test_api_vit_haploid_multi.py
+++ b/tests/test_api_vit_haploid_multi.py
@@ -53,6 +53,8 @@ def test_ts_multiallelic_n10_no_recomb(
     @pytest.mark.parametrize("num_samples", [6, 8, 16])
     @pytest.mark.parametrize("scale_mutation_rate", [True, False])
     @pytest.mark.parametrize("include_ancestors", [True, False])
-    def test_ts_multiallelic_n16(self, num_samples, scale_mutation_rate, include_ancestors):
+    def test_ts_multiallelic_n16(
+        self, num_samples, scale_mutation_rate, include_ancestors
+    ):
         ts = self.get_ts_multiallelic(num_samples)
         self.verify(ts, scale_mutation_rate, include_ancestors)