Migrate relay to testProxy

sdk/relay/azure-mgmt-relay/dev_requirements.txt

@@ -1,2 +1,3 @@
 -e ../../../tools/azure-sdk-tools
--e ../../../tools/azure-devtools
+-e ../../../tools/azure-devtools
+../../identity/azure-identity

sdk/relay/azure-mgmt-relay/tests/conftest.py

@@ -0,0 +1,47 @@
+# --------------------------------------------------------------------------
+#
+# 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.
+#
+# --------------------------------------------------------------------------
+import os
+import platform
+import pytest
+import sys
+
+from dotenv import load_dotenv
+
+from devtools_testutils import test_proxy, add_general_regex_sanitizer
+
+# Ignore async tests for Python < 3.5
+collect_ignore_glob = []
+if sys.version_info < (3, 5) or platform.python_implementation() == "PyPy":
+    collect_ignore_glob.append("*_async.py")
+
+load_dotenv()
+
+@pytest.fixture(scope="session", autouse=True)
+def add_sanitizers(test_proxy):
+    subscription_id = os.environ.get("AZURE_SUBSCRIPTION_ID", "00000000-0000-0000-0000-000000000000")
+    tenant_id = os.environ.get("AZURE_TENANT_ID", "00000000-0000-0000-0000-000000000000")
+    add_general_regex_sanitizer(regex=subscription_id, value="00000000-0000-0000-0000-000000000000")
+    add_general_regex_sanitizer(regex=tenant_id, value="00000000-0000-0000-0000-000000000000")