test: added tests for known bugs

Added tests for issues #224/#225 and #229. Since
these are known bugs, the tests are currently
marked as expected failures. Once the solution
is implemented, that designation can be removed
and we'll still keep the test to make sure there
aren't any regressions.

main.py

@@ -105,6 +105,9 @@ def process_diff(diff, client=Client(), insert_issue_urls=False, parser=TodoPars
         # Stagger the requests to be on the safe side.
         sleep(1)
 
+    return raw_issues
+
+
 if __name__ == "__main__":
     client: Client | None = None
     # Try to create a basic client for communicating with the remote version control server, automatically initialised with environment variables.