add sample for raw_response_hook (#19985)

* add sample for raw_response_hook

* update

Author: xiangyan99

sdk/core/azure-core/samples/test_example_policies.py

@@ -0,0 +1,45 @@
+# --------------------------------------------------------------------------
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+#
+# The MIT License (MIT)
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the ""Software""), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+#
+# --------------------------------------------------------------------------
+
+def test_example_raw_response_hook():
+    def callback(response):
+        response.http_response.status_code = 200
+        response.http_response.headers["custom_header"] = "CustomHeader"
+
+    from azure.core.pipeline import Pipeline
+    from azure.core.pipeline.policies import RedirectPolicy, UserAgentPolicy
+    from azure.core.pipeline.transport import RequestsTransport, HttpRequest
+    from azure.core.pipeline.policies import CustomHookPolicy
+
+    request = HttpRequest("GET", "https://bing.com")
+    policies = [
+        CustomHookPolicy(raw_response_hook=callback)
+    ]
+
+    with Pipeline(transport=RequestsTransport(), policies=policies) as pipeline:
+        response = pipeline.run(request)
+        assert response.http_response.status_code == 200
+        assert response.http_response.headers["custom_header"] == "CustomHeader"