diff --git a/src/xdist/dsession.py b/src/xdist/dsession.py
index 4c3bcec2..3ead8b55 100644
--- a/src/xdist/dsession.py
+++ b/src/xdist/dsession.py
@@ -180,7 +180,6 @@ def loop_once(self) -> None:
         if self.sched.tests_finished:
             self.triggershutdown()
 
-
     def is_node_finishing(self, node: WorkerController) -> bool:
         """Check if a test worker is considered to be finishing.
 
@@ -191,32 +190,33 @@ def is_node_finishing(self, node: WorkerController) -> bool:
         pending = self.sched.node2pending.get(node)
         return pending is not None and len(pending) < 2
 
-
     def are_all_nodes_finishing(self) -> bool:
         """Check if all workers are finishing (See 'is_node_finishing' above)."""
         assert self.sched is not None
         return all(self.is_node_finishing(node) for node in self.sched.nodes)
 
-
     def are_all_nodes_done(self) -> bool:
         """Check if all nodes have reported to finish."""
         return all(s == "finished" for s in self.worker_status.values())
 
-
     def are_all_active_nodes_collected(self) -> bool:
         """Check if all nodes have reported collection to be complete."""
         if not all(n.gateway.id in self.worker_status for n in self._active_nodes):
             return False
-        return all(self.worker_status[n.gateway.id] == "collected" for n in self._active_nodes)
-
+        return all(
+            self.worker_status[n.gateway.id] == "collected" for n in self._active_nodes
+        )
 
     def reset_nodes_if_needed(self) -> None:
         assert self.sched is not None
         assert type(self.sched) is CustomGroup
-        if self.are_all_nodes_finishing() and self.ready_to_run_tests and not self.sched.do_resched:
+        if (
+            self.are_all_nodes_finishing()
+            and self.ready_to_run_tests
+            and not self.sched.do_resched
+        ):
             self.reset_nodes()
 
-
     def reset_nodes(self) -> None:
         """Issue shutdown notices to workers for rescheduling purposes."""
         assert self.sched is not None
@@ -227,7 +227,6 @@ def reset_nodes(self) -> None:
             if self.is_node_finishing(node):
                 node.shutdown()
 
-
     def reschedule(self) -> None:
         """Reschedule tests."""
         assert self.sched is not None
@@ -235,13 +234,14 @@ def reschedule(self) -> None:
         self.sched.do_resched = False
         self.sched.check_schedule(self.sched.nodes[0], 1.0, True)
 
-
     def prepare_for_reschedule(self) -> None:
         """Update test workers and their status tracking so rescheduling is ready."""
         assert type(self.sched) is CustomGroup
         assert self.sched is not None
         self.remake_nodes = False
-        num_workers = self.sched.dist_groups[self.sched.pending_groups[0]]['group_workers']
+        num_workers = self.sched.dist_groups[self.sched.pending_groups[0]][
+            "group_workers"
+        ]
         self.trdist._status = {}
         assert self.nodemanager is not None
         new_nodes = self.nodemanager.setup_nodes(self.saved_put, num_workers)
@@ -295,8 +295,10 @@ def worker_workerfinished(self, node: WorkerController) -> None:
                 try:
                     self.prepare_for_reschedule()
                 except Exception as e:
-                    msg = ("Exception caught during preparation for rescheduling. Giving up."
-                           f"\n{''.join(traceback.format_exception(e))}")
+                    msg = (
+                        "Exception caught during preparation for rescheduling. Giving up."
+                        f"\n{''.join(traceback.format_exception(e))}"
+                    )
                     self.shouldstop = msg
             return
         self.config.hook.pytest_testnodedown(node=node, error=None)
@@ -392,7 +394,9 @@ def worker_collectionfinish(
         scheduling the first time it logs which scheduler is in use.
         """
         if self.shuttingdown:
-            self.report_line(f"[-] [dse] collectionfinish while closing {node.gateway.id}")
+            self.report_line(
+                f"[-] [dse] collectionfinish while closing {node.gateway.id}"
+            )
             return
         self.update_worker_status(node, "collected")
 
@@ -412,7 +416,9 @@ def worker_collectionfinish(
                 self.trdist.ensure_show_status()
                 self.terminal.write_line("")
                 if self.config.option.verbose > 0:
-                    self.report_line(f"[-] [dse] scheduling tests via {self.sched.__class__.__name__}")
+                    self.report_line(
+                        f"[-] [dse] scheduling tests via {self.sched.__class__.__name__}"
+                    )
             if isinstance(self.sched, CustomGroup):
                 if self.ready_to_run_tests and self.are_all_active_nodes_collected():
                     # we're coming back here after finishing a batch of tests - so start the next batch
diff --git a/src/xdist/remote.py b/src/xdist/remote.py
index 0ec9047d..e032f1b7 100644
--- a/src/xdist/remote.py
+++ b/src/xdist/remote.py
@@ -209,7 +209,9 @@ def pytest_collection_modifyitems(
     ) -> None:
         # add the group name to nodeid as suffix if --dist=loadgroup
         if config.getvalue("loadgroup") or config.getvalue("customgroup"):
-            functional_mark = "xdist_group" if config.getvalue("loadgroup") else "xdist_custom"
+            functional_mark = (
+                "xdist_group" if config.getvalue("loadgroup") else "xdist_custom"
+            )
             for item in items:
                 mark = item.get_closest_marker(functional_mark)
                 if not mark:
diff --git a/src/xdist/scheduler/customgroup.py b/src/xdist/scheduler/customgroup.py
index 5d1439a2..85824225 100644
--- a/src/xdist/scheduler/customgroup.py
+++ b/src/xdist/scheduler/customgroup.py
@@ -189,7 +189,6 @@ def mark_test_complete(
         self.check_schedule(node, duration=duration)
 
     def mark_test_pending(self, item: str) -> None:
-
         assert self.collection is not None
         self.pending.insert(
             0,
@@ -205,7 +204,9 @@ def remove_pending_tests_from_node(
     ) -> None:
         raise NotImplementedError()
 
-    def check_schedule(self, node: WorkerController, duration: float = 0, from_dsession: bool = False) -> None:
+    def check_schedule(
+        self, node: WorkerController, duration: float = 0, from_dsession: bool = False
+    ) -> None:
         """Maybe schedule new items on the node.
 
         If there are any globally pending nodes left then this will
@@ -214,7 +215,9 @@ def check_schedule(self, node: WorkerController, duration: float = 0, from_dsess
         heuristic to influence how many tests the node is assigned.
         """
         if node.shutting_down:
-            self.report_line(f"[-] [csg] {node.workerinput['workerid']} is already shutting down")
+            self.report_line(
+                f"[-] [csg] {node.workerinput['workerid']} is already shutting down"
+            )
             return
 
         if self.pending:
@@ -227,18 +230,25 @@ def check_schedule(self, node: WorkerController, duration: float = 0, from_dsess
                 if self.pending_groups:
                     dist_group_key = self.pending_groups.pop(0)
                     dist_group = self.dist_groups[dist_group_key]
-                    nodes = cycle(self.nodes[0:dist_group['group_workers']])
-                    schedule_log: dict[str, Any] = {n.gateway.id:[] for n in self.nodes[0:dist_group['group_workers']]}
-                    for _ in range(len(dist_group['test_indices'])):
+                    nodes = cycle(self.nodes[0 : dist_group["group_workers"]])
+                    schedule_log: dict[str, Any] = {
+                        n.gateway.id: []
+                        for n in self.nodes[0 : dist_group["group_workers"]]
+                    }
+                    for _ in range(len(dist_group["test_indices"])):
                         n = next(nodes)
-                        #needs cleaner way to be identified
-                        tests_per_node = self.dist_groups[dist_group_key]['pending_indices'][:1]
+                        # needs cleaner way to be identified
+                        tests_per_node = self.dist_groups[dist_group_key][
+                            "pending_indices"
+                        ][:1]
                         schedule_log[n.gateway.id].extend(tests_per_node)
 
                         self._send_tests_group(n, 1, dist_group_key)
                     del self.dist_groups[dist_group_key]
-                    message = (f"\n[-] [csg] check_schedule: processed scheduling for {dist_group_key}:"
-                               f" {' '.join([f'{nid} ({len(nt)})' for nid,nt in schedule_log.items()])}")
+                    message = (
+                        f"\n[-] [csg] check_schedule: processed scheduling for {dist_group_key}:"
+                        f" {' '.join([f'{nid} ({len(nt)})' for nid,nt in schedule_log.items()])}"
+                    )
                     self.report_line(message)
 
         else:
@@ -310,26 +320,28 @@ def schedule(self) -> None:
 
         if self.is_first_time:
             for i, test in enumerate(self.collection):
-                if '@' in test:
-                    group_mark = test.split('@')[-1]
-                    group_workers = int(group_mark.split('_')[-1])
+                if "@" in test:
+                    group_mark = test.split("@")[-1]
+                    group_workers = int(group_mark.split("_")[-1])
                     if group_workers > len(self.nodes):
                         # We can only distribute across as many nodes as we have available
                         # If a group requests more, we fallback to our actual max
                         group_workers = len(self.nodes)
                 else:
-                    group_mark = 'default'
+                    group_mark = "default"
                     group_workers = len(self.nodes)
-                existing_tests = dist_groups.get(group_mark, {}).get('tests', [])
+                existing_tests = dist_groups.get(group_mark, {}).get("tests", [])
                 existing_tests.append(test)
-                existing_indices = dist_groups.get(group_mark, {}).get('test_indices', [])
+                existing_indices = dist_groups.get(group_mark, {}).get(
+                    "test_indices", []
+                )
                 existing_indices.append(i)
 
                 dist_groups[group_mark] = {
-                    'tests': existing_tests,
-                    'group_workers': group_workers,
-                    'test_indices': existing_indices,
-                    'pending_indices': existing_indices
+                    "tests": existing_tests,
+                    "group_workers": group_workers,
+                    "test_indices": existing_indices,
+                    "pending_indices": existing_indices,
                 }
             self.dist_groups = dist_groups
             self.pending_groups = list(dist_groups.keys())
@@ -342,17 +354,21 @@ def schedule(self) -> None:
             return
         dist_group_key = self.pending_groups.pop(0)
         dist_group = self.dist_groups[dist_group_key]
-        nodes = cycle(self.nodes[0:dist_group['group_workers']])
-        schedule_log: dict[str, Any] = {n.gateway.id: [] for n in self.nodes[0:dist_group['group_workers']]}
-        for _ in range(len(dist_group['test_indices'])):
+        nodes = cycle(self.nodes[0 : dist_group["group_workers"]])
+        schedule_log: dict[str, Any] = {
+            n.gateway.id: [] for n in self.nodes[0 : dist_group["group_workers"]]
+        }
+        for _ in range(len(dist_group["test_indices"])):
             n = next(nodes)
             # needs cleaner way to be identified
-            tests_per_node = self.dist_groups[dist_group_key]['pending_indices'][:1]
+            tests_per_node = self.dist_groups[dist_group_key]["pending_indices"][:1]
             schedule_log[n.gateway.id].extend(tests_per_node)
             self._send_tests_group(n, 1, dist_group_key)
         del self.dist_groups[dist_group_key]
-        message = ("\n[-] [csg] schedule: processed scheduling for "
-        f"{dist_group_key}: {' '.join([f'{nid} ({len(nt)})' for nid, nt in schedule_log.items()])}")
+        message = (
+            "\n[-] [csg] schedule: processed scheduling for "
+            f"{dist_group_key}: {' '.join([f'{nid} ({len(nt)})' for nid, nt in schedule_log.items()])}"
+        )
         self.report_line(message)
 
     def _send_tests(self, node: WorkerController, num: int) -> None:
@@ -362,16 +378,17 @@ def _send_tests(self, node: WorkerController, num: int) -> None:
             self.node2pending[node].extend(tests_per_node)
             node.send_runtest_some(tests_per_node)
 
-    def _send_tests_group(self, node: WorkerController, num: int, dist_group_key: str) -> None:
-        tests_per_node = self.dist_groups[dist_group_key]['pending_indices'][:num]
+    def _send_tests_group(
+        self, node: WorkerController, num: int, dist_group_key: str
+    ) -> None:
+        tests_per_node = self.dist_groups[dist_group_key]["pending_indices"][:num]
         if tests_per_node:
-            del self.dist_groups[dist_group_key]['pending_indices'][:num]
+            del self.dist_groups[dist_group_key]["pending_indices"][:num]
             for test_index in tests_per_node:
                 self.pending.remove(test_index)
             self.node2pending[node].extend(tests_per_node)
             node.send_runtest_some(tests_per_node)
 
-
     def _check_nodes_have_same_collection(self) -> bool:
         """Return True if all nodes have collected the same items.
 
diff --git a/src/xdist/workermanage.py b/src/xdist/workermanage.py
index 963dbb8a..c130bb5c 100644
--- a/src/xdist/workermanage.py
+++ b/src/xdist/workermanage.py
@@ -82,7 +82,7 @@ def rsync_roots(self, gateway: execnet.Gateway) -> None:
     def setup_nodes(
         self,
         putevent: Callable[[tuple[str, dict[str, Any]]], None],
-        max_nodes: int | None = None
+        max_nodes: int | None = None,
     ) -> list[WorkerController]:
         self.config.hook.pytest_xdist_setupnodes(config=self.config, specs=self.specs)
         self.trace("setting up nodes")
diff --git a/xdist-testing-ntop/test.py b/xdist-testing-ntop/test.py
index 4b370b6c..e43e881b 100644
--- a/xdist-testing-ntop/test.py
+++ b/xdist-testing-ntop/test.py
@@ -8,21 +8,25 @@ def test_1():
     time.sleep(2)
     assert True
 
+
 @pytest.mark.xdist_custom(name="low_4")
 def test_2():
     time.sleep(2)
     assert True
 
+
 @pytest.mark.xdist_custom(name="low_4")
 def test_3():
     time.sleep(2)
     assert True
 
+
 @pytest.mark.xdist_custom(name="low_4")
 def test_4():
     time.sleep(2)
     assert True
 
+
 # @pytest.mark.xdist_custom(name="low_4")
 # def test_4a():
 #     time.sleep(2)
@@ -48,48 +52,58 @@ def test_4():
 #     time.sleep(2)
 #     assert True
 
+
 @pytest.mark.xdist_custom(name="med_2")
 def test_5():
     time.sleep(3)
     assert True
 
+
 @pytest.mark.xdist_custom(name="med_2")
 def test_6():
     time.sleep(3)
     assert True
 
+
 @pytest.mark.xdist_custom(name="med_2")
 def test_7():
     time.sleep(3)
     assert True
 
+
 @pytest.mark.xdist_custom(name="med_2")
 def test_8():
     time.sleep(3)
     assert True
 
+
 @pytest.mark.xdist_custom(name="high_1")
 def test_9():
     time.sleep(5)
     assert True
 
+
 @pytest.mark.xdist_custom(name="high_1")
 def test_10():
     time.sleep(5)
     assert True
 
+
 def test_11():
     time.sleep(1)
     assert True
 
+
 def test_12():
     time.sleep(1)
     assert True
 
+
 def test_13():
     time.sleep(1)
     assert True
 
+
 def test_14():
     time.sleep(1)
     assert True