Group VuMark generation tests in class (#2957)

* Group VuMark generation tests in TestGenerateInstance class

Move test_generate_instance_success into a TestGenerateInstance class and apply the @pytest.mark.usefixtures decorator at the class level to reduce duplication.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

* Make test_generate_instance_success a static method

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

Author: adamtheturtle

tests/mock_vws/test_vumark_generation_api.py

@@ -15,41 +15,46 @@
 
 
 @pytest.mark.usefixtures("verify_mock_vuforia")
-def test_generate_instance_success(
-    vumark_vuforia_database: VuMarkVuforiaDatabase,
-) -> None:
-    """A VuMark instance can be generated with valid template settings."""
-    request_path = f"/targets/{vumark_vuforia_database.target_id}/instances"
-    content_type = "application/json"
-    generated_instance_id = uuid4().hex
-    content = json.dumps(obj={"instance_id": generated_instance_id}).encode(
-        encoding="utf-8"
-    )
-    date = rfc_1123_date()
-    authorization_string = authorization_header(
-        access_key=vumark_vuforia_database.server_access_key,
-        secret_key=vumark_vuforia_database.server_secret_key,
-        method=HTTPMethod.POST,
-        content=content,
-        content_type=content_type,
-        date=date,
-        request_path=request_path,
-    )
-
-    response = requests.post(
-        url=_VWS_HOST + request_path,
-        headers={
-            "Accept": "image/png",
-            "Authorization": authorization_string,
-            "Content-Length": str(object=len(content)),
-            "Content-Type": content_type,
-            "Date": date,
-        },
-        data=content,
-        timeout=30,
-    )
-
-    assert response.status_code == HTTPStatus.OK
-    assert response.headers["Content-Type"].split(sep=";")[0] == "image/png"
-    assert response.content.startswith(_PNG_SIGNATURE)
-    assert len(response.content) > len(_PNG_SIGNATURE)
+class TestGenerateInstance:
+    """Tests for the VuMark instance generation endpoint."""
+
+    @staticmethod
+    def test_generate_instance_success(
+        vumark_vuforia_database: VuMarkVuforiaDatabase,
+    ) -> None:
+        """A VuMark instance can be generated with valid template settings."""
+        target_id = vumark_vuforia_database.target_id
+        request_path = f"/targets/{target_id}/instances"
+        content_type = "application/json"
+        generated_instance_id = uuid4().hex
+        body_dict = {"instance_id": generated_instance_id}
+        content = json.dumps(obj=body_dict).encode(encoding="utf-8")
+        date = rfc_1123_date()
+        authorization_string = authorization_header(
+            access_key=vumark_vuforia_database.server_access_key,
+            secret_key=vumark_vuforia_database.server_secret_key,
+            method=HTTPMethod.POST,
+            content=content,
+            content_type=content_type,
+            date=date,
+            request_path=request_path,
+        )
+
+        response = requests.post(
+            url=_VWS_HOST + request_path,
+            headers={
+                "Accept": "image/png",
+                "Authorization": authorization_string,
+                "Content-Length": str(object=len(content)),
+                "Content-Type": content_type,
+                "Date": date,
+            },
+            data=content,
+            timeout=30,
+        )
+
+        assert response.status_code == HTTPStatus.OK
+        content_type_value = response.headers["Content-Type"].split(sep=";")[0]
+        assert content_type_value == "image/png"
+        assert response.content.startswith(_PNG_SIGNATURE)
+        assert len(response.content) > len(_PNG_SIGNATURE)