From f941e64dc39e7e08e43bc110d43014f0d2d29665 Mon Sep 17 00:00:00 2001
From: Stephen Rosen <sirosen@globus.org>
Date: Mon, 22 Dec 2025 11:08:05 -0600
Subject: [PATCH] Add a fixture and test for Transfer cancel_task

---
 .../testing/data/transfer/cancel_task.py      | 21 +++++++++++++++++++
 .../services/transfer/test_cancel_task.py     | 13 ++++++++----
 2 files changed, 30 insertions(+), 4 deletions(-)
 create mode 100644 src/globus_sdk/testing/data/transfer/cancel_task.py

diff --git a/src/globus_sdk/testing/data/transfer/cancel_task.py b/src/globus_sdk/testing/data/transfer/cancel_task.py
new file mode 100644
index 000000000..091f2cdab
--- /dev/null
+++ b/src/globus_sdk/testing/data/transfer/cancel_task.py
@@ -0,0 +1,21 @@
+import uuid
+
+from globus_sdk.testing.models import RegisteredResponse, ResponseSet
+
+TASK_ID = str(uuid.uuid4())
+
+RESPONSES = ResponseSet(
+    metadata={"task_id": TASK_ID},
+    default=RegisteredResponse(
+        service="transfer",
+        path=f"/v0.10/task/{TASK_ID}/cancel",
+        method="POST",
+        json={
+            "DATA_TYPE": "result",
+            "code": "Canceled",
+            "message": "The task has been cancelled successfully.",
+            "resource": f"/task/{TASK_ID}/cancel",
+            "request_id": "ABCdef789",
+        },
+    ),
+)
diff --git a/tests/functional/services/transfer/test_cancel_task.py b/tests/functional/services/transfer/test_cancel_task.py
index e8de569e3..6ba123a0d 100644
--- a/tests/functional/services/transfer/test_cancel_task.py
+++ b/tests/functional/services/transfer/test_cancel_task.py
@@ -1,6 +1,11 @@
-import pytest
+from globus_sdk.testing import get_last_request, load_response
 
 
-@pytest.mark.xfail
-def test_cancel_task():
-    raise NotImplementedError
+def test_cancel_task(client):
+    meta = load_response(client.cancel_task).metadata
+
+    res = client.cancel_task(meta["task_id"])
+    assert res.http_status == 200
+
+    req = get_last_request()
+    assert req.body is None