diff --git a/test/webapi/ows/coverages/test_context.py b/test/webapi/ows/coverages/test_context.py
index 8c61b249d..64d550c6c 100644
--- a/test/webapi/ows/coverages/test_context.py
+++ b/test/webapi/ows/coverages/test_context.py
@@ -20,7 +20,6 @@
 # DEALINGS IN THE SOFTWARE.
 
 
-
 import unittest
 from typing import Optional, Union, Mapping, Any
 
@@ -31,13 +30,12 @@
 
 
 def get_coverages_ctx(
-        server_config: Optional[Union[str, Mapping[str, Any]]] = None
+    server_config: Optional[Union[str, Mapping[str, Any]]] = None
 ) -> CoveragesContext:
     return get_api_ctx("ows.coverages", CoveragesContext, server_config)
 
 
 class CoveragesContextTest(unittest.TestCase):
-
     def test_ctx_ok(self):
         ctx = get_coverages_ctx()
         self.assertIsInstance(ctx.server_ctx, Context)
diff --git a/test/webapi/ows/coverages/test_controllers.py b/test/webapi/ows/coverages/test_controllers.py
index 7974a8572..8254a67d6 100644
--- a/test/webapi/ows/coverages/test_controllers.py
+++ b/test/webapi/ows/coverages/test_controllers.py
@@ -29,31 +29,32 @@
 import rioxarray
 
 from test.webapi.ows.coverages.test_context import get_coverages_ctx
-from xcube.webapi.ows.coverages.controllers import get_coverage_as_json, \
-    get_coverage_data
+from xcube.webapi.ows.coverages.controllers import (
+    get_coverage_as_json,
+    get_coverage_data,
+)
 
 
 class CoveragesControllersTest(unittest.TestCase):
-
     def test_get_coverage_as_json(self):
-        result = get_coverage_as_json(get_coverages_ctx().datasets_ctx,
-                                      'demo')
+        result = get_coverage_as_json(get_coverages_ctx().datasets_ctx, 'demo')
         self.assertIsInstance(result, dict)
         path = Path(__file__).parent / 'expected.json'
         # with open(path, mode="w") as fp:
         #     json.dump(result, fp, indent=2)
         with open(path, mode="r") as fp:
-           expected_result = json.load(fp)
+            expected_result = json.load(fp)
         self.assertEqual(expected_result, result)
 
     def test_get_coverage_data_tiff(self):
         query = dict(
             bbox=['52,1,51,2'],
             datetime=['2017-01-25'],
-            properties=['conc_chl']
+            properties=['conc_chl'],
+        )
+        result = get_coverage_data(
+            get_coverages_ctx().datasets_ctx, 'demo', query, 'image/tiff'
         )
-        result = get_coverage_data(get_coverages_ctx().datasets_ctx,
-                                      'demo', query, 'image/tiff')
         with BytesIO(result) as fh:
             da = rioxarray.open_rasterio(fh)
             self.assertIsInstance(da, xr.DataArray)
@@ -65,10 +66,14 @@ def test_get_coverage_data_netcdf(self):
         query = dict(
             bbox=['52,1,51,2'],
             datetime=['2017-01-25'],
-            properties=['conc_chl,kd489']
+            properties=['conc_chl,kd489'],
+        )
+        result = get_coverage_data(
+            get_coverages_ctx().datasets_ctx,
+            'demo',
+            query,
+            'application/netcdf',
         )
-        result = get_coverage_data(get_coverages_ctx().datasets_ctx,
-                                      'demo', query, 'application/netcdf')
         # We can't read this directly from memory: the netcdf4 engine only
         # reads from filesystem paths, the h5netcdf engine (which can read
         # from memory) isn't an xcube dependency, and the scipy engine only
@@ -83,6 +88,14 @@ def test_get_coverage_data_netcdf(self):
             self.assertEqual(list(ds.data_vars), ['conc_chl', 'kd489'])
             self.assertEqual(
                 list(ds.variables),
-                ['lat', 'lat_bnds', 'lon', 'lon_bnds', 'time', 'time_bnds',
-                 'conc_chl', 'kd489']
+                [
+                    'lat',
+                    'lat_bnds',
+                    'lon',
+                    'lon_bnds',
+                    'time',
+                    'time_bnds',
+                    'conc_chl',
+                    'kd489',
+                ],
             )
diff --git a/test/webapi/ows/coverages/test_routes.py b/test/webapi/ows/coverages/test_routes.py
index bd5592ec3..cf7521708 100644
--- a/test/webapi/ows/coverages/test_routes.py
+++ b/test/webapi/ows/coverages/test_routes.py
@@ -23,7 +23,6 @@
 
 
 class CoveragesRoutesTest(RoutesTestCase):
-
     def test_fetch_coverage(self):
         response = self.fetch('/catalog/collections/demo/coverage?f=text/json')
         self.assertResponseOK(response)
@@ -33,11 +32,15 @@ def test_fetch_domainset(self):
         self.assertResponseOK(response)
 
     def test_fetch_rangetype(self):
-        response = self.fetch('/catalog/collections/{collectionId}/coverage/rangetype')
+        response = self.fetch(
+            '/catalog/collections/{collectionId}/coverage/rangetype'
+        )
         self.assertResponseOK(response)
 
     def test_fetch_metadata(self):
-        response = self.fetch('/catalog/collections/{collectionId}/coverage/metadata')
+        response = self.fetch(
+            '/catalog/collections/{collectionId}/coverage/metadata'
+        )
         self.assertResponseOK(response)
 
     def test_fetch_rangeset(self):
diff --git a/xcube/webapi/ows/coverages/context.py b/xcube/webapi/ows/coverages/context.py
index 3ce9a1b4c..6ea47818b 100644
--- a/xcube/webapi/ows/coverages/context.py
+++ b/xcube/webapi/ows/coverages/context.py
@@ -27,11 +27,11 @@
 
 
 class CoveragesContext(ResourcesContext):
-
     def __init__(self, server_ctx: Context):
         super().__init__(server_ctx)
-        self._datasets_ctx = server_ctx.get_api_ctx('datasets',
-                                                    cls=DatasetsContext)
+        self._datasets_ctx = server_ctx.get_api_ctx(
+            'datasets', cls=DatasetsContext
+        )
 
     @property
     def datasets_ctx(self) -> DatasetsContext: