Fix ref

Author: andystaples

articles/azure-functions/functions-reference-python.md

@@ -1428,7 +1428,7 @@ class TestFunction(unittest.TestCase):
 Inside your *.venv* Python virtual environment folder, install your favorite Python test framework, such as `pip install pytest`. Then run `pytest tests` to check the test result.
 
 > [!NOTE]
-> Durable Functions require special syntax for unit testing. For more information, refer to [Unit Testing Durable Functions in Python](durable-functions-unit-testing-python.md)
+> Durable Functions require special syntax for unit testing. For more information, refer to [Unit Testing Durable Functions in Python](durable/durable-functions-unit-testing-python.md)
 
 ::: zone-end