Disable isolate worker dependencies for Python 3.9 (#855)

* Disable isolate worker dependencies

* Mark unittest

* Skip tests that assumes the feature flags are turned on

Author: Hazhzeng

azure_functions_worker/constants.py

@@ -37,7 +37,7 @@
 PYTHON_THREADPOOL_THREAD_COUNT_MIN = 1
 PYTHON_THREADPOOL_THREAD_COUNT_MAX = 32
 PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT = False
-PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_39 = True
+PYTHON_ISOLATE_WORKER_DEPENDENCIES_DEFAULT_39 = False
 PYTHON_ENABLE_WORKER_EXTENSIONS_DEFAULT = False
 PYTHON_ENABLE_WORKER_EXTENSIONS_DEFAULT_39 = True
 

tests/unittests/test_utilities_dependency.py

@@ -454,9 +454,8 @@ def test_use_worker_dependencies_default_python_36_37_38(self):
         with self.assertRaises(ImportError):
             import common_module  # NoQA
 
-    @unittest.skipUnless(
-        sys.version_info.major == 3 and sys.version_info.minor == 9,
-        'Test only available for Python 3.9'
+    @unittest.skip(
+        'Test is not available due to feature flag is turned off'
     )
     def test_use_worker_dependencies_default_python_39(self):
         # Feature should be enabled in Python 3.9 by default
@@ -523,9 +522,8 @@ def test_prioritize_customer_dependencies_default_python_36_37_38(self):
         with self.assertRaises(ImportError):
             import common_module  # NoQA
 
-    @unittest.skipUnless(
-        sys.version_info.major == 3 and sys.version_info.minor == 9,
-        'Test only available for Python 3.9'
+    @unittest.skip(
+        'Test is not available since feature flag is turned off'
     )
     def test_prioritize_customer_dependencies_default_python_39(self):
         # Feature should be enabled in Python 3.9 by default