eventgrid source reference fix

Author: Victoria Hall

azure/functions/decorators/blob.py

@@ -17,7 +17,7 @@ def __init__(self,
                  **kwargs):
         self.path = path
         self.connection = connection
-        self.source = source
+        self.source = source.value if source else source
         super().__init__(name=name, data_type=data_type)
 
     @staticmethod

tests/decorators/test_blob.py

@@ -42,7 +42,7 @@ def test_blob_trigger_creation_with_default_specified_source(self):
             "name": "req",
             "dataType": DataType.UNDEFINED,
             "path": "dummy_path",
-            'source': BlobSource.LOGS_AND_CONTAINER_SCAN,
+            'source': 'LogsAndContainerScan',
             "connection": "dummy_connection"
         })
 
@@ -62,7 +62,7 @@ def test_blob_trigger_creation_with_source_as_string(self):
             "name": "req",
             "dataType": DataType.UNDEFINED,
             "path": "dummy_path",
-            'source': BlobSource.EVENT_GRID,
+            'source': 'EventGrid',
             "connection": "dummy_connection"
         })
 
@@ -82,7 +82,7 @@ def test_blob_trigger_creation_with_source_as_enum(self):
             "name": "req",
             "dataType": DataType.UNDEFINED,
             "path": "dummy_path",
-            'source': BlobSource.EVENT_GRID,
+            'source': 'EventGrid',
             "connection": "dummy_connection"
         })