diff --git a/tests-dir/pytestcases/test_1_reconstructions.py b/tests-dir/pytestcases/test_1_reconstructions.py
index 160a6502..0ebb7c56 100644
--- a/tests-dir/pytestcases/test_1_reconstructions.py
+++ b/tests-dir/pytestcases/test_1_reconstructions.py
@@ -163,7 +163,7 @@ def test_cont_arc_length(time, model, muller_2019_model):
         # Check arc length approximately matches precomputed value
         cmp = approx_lengths[time]
         diff = np.abs(total_cont_arc_length - cmp)
-        assert diff <= 1000.0, err_msg
+        assert diff <= 3000.0, err_msg
     else:
         # Value for this time has not been computed, so just make sure no
         # errors were encountered
@@ -198,10 +198,9 @@ def test_rotation_model_copy(model):
 
 
 def test_reconstruction_filenames(model):
-    assert (
-        "Muller_etal_2019_PlateBoundaries_DeformingNetworks.gpmlz"
-        in [os.path.basename(i) for i in model.topology_features.filenames]
-    )
+    assert "Muller_etal_2019_PlateBoundaries_DeformingNetworks.gpmlz" in [
+        os.path.basename(i) for i in model.topology_features.filenames
+    ]
 
 
 def test_pickle_reconstruction(model):
diff --git a/tests-dir/pytestcases/test_2_points.py b/tests-dir/pytestcases/test_2_points.py
index d5ae3641..4b97e2cc 100644
--- a/tests-dir/pytestcases/test_2_points.py
+++ b/tests-dir/pytestcases/test_2_points.py
@@ -24,25 +24,37 @@
 
 """
 
+
 # TESTING THE POINTS OBJECT
 @pytest.mark.parametrize("time", reconstruction_times)
 def test_point_reconstruction(time, gpts):
     rlons, rlats = gpts.reconstruct(time, return_array=True, anchor_plate_id=0)
-    assert (rlons, rlats), "Unable to reconstruct point data to {} Ma with Muller et al. (2019).".format(time)
+    assert (
+        rlons and rlats
+    ), "Unable to reconstruct point data to {} Ma with Muller et al. (2019).".format(
+        time
+    )
+
 
-       
 # TESTING PLATE VELOCITY CALCULATIONS
 @pytest.mark.parametrize("time", reconstruction_times)
 def test_plate_velocity(time, gpts):
     plate_vel = gpts.plate_velocity(time, delta_time=1)
-    assert plate_vel, "Unable to calculate plate velocities of point data at {} Ma with Muller et al. (2019).".format(time)
+    assert (
+        plate_vel
+    ), "Unable to calculate plate velocities of point data at {} Ma with Muller et al. (2019).".format(
+        time
+    )
+
 
 def test_point_attributes(gpts):
     attr = np.arange(0, gpts.size)
     gpts.add_attributes(FROMAGE=attr, TOAGE=attr)
 
+
 def test_pickle_Points(gpts):
     import pickle
+
     gpts_dump = pickle.dumps(gpts)
     gpts_load = pickle.loads(gpts_dump)
 
@@ -51,5 +63,8 @@ def test_pickle_Points(gpts):
     gpts_dump = pickle.dumps(gpts)
     gpts_load = pickle.loads(gpts_dump)
 
+
 def test_change_ancbor_plate(gpts):
-    gpts.rotate_reference_frames(50, from_rotation_reference_plate=0, to_rotation_reference_plate=101)
+    gpts.rotate_reference_frames(
+        50, from_rotation_reference_plate=0, to_rotation_reference_plate=101
+    )