diff --git a/xarray/tests/test_interp.py b/xarray/tests/test_interp.py
index 56822d20fd7..2859e986059 100644
--- a/xarray/tests/test_interp.py
+++ b/xarray/tests/test_interp.py
@@ -10,9 +10,16 @@
 import xarray as xr
 from xarray.coding.cftimeindex import _parse_array_of_cftime_strings
 from xarray.core.types import InterpOptions
-from xarray.tests import (assert_allclose, assert_equal, assert_identical,
-                          has_dask, has_scipy, requires_cftime, requires_dask,
-                          requires_scipy)
+from xarray.tests import (
+    assert_allclose,
+    assert_equal,
+    assert_identical,
+    has_dask,
+    has_scipy,
+    requires_cftime,
+    requires_dask,
+    requires_scipy,
+)
 from xarray.tests.test_dataset import create_test_data
 
 try: