Fix

Author: krassowski

jupyterlab_code_formatter/formatters.py

@@ -390,6 +390,8 @@ class StylerFormatter(RFormatter):
 
     @handle_line_ending_and_magic
     def format_code(self, code: str, notebook: bool, **options) -> str:
+        # while not used, this import is needed to load conversion rules
+        import rpy2.robjects
         import rpy2.robjects.packages as rpackages
 
         styler_r = rpackages.importr(self.package_name)

jupyterlab_code_formatter/tests/test_handlers.py

@@ -444,7 +444,6 @@ async def test_can_use_styler2(request_format):  # type: ignore[no-untyped-def]
         expected_code=200,
         expected_schema=EXPECTED_FROMAT_SCHEMA,
     )
-    assert not json_result
     assert json_result["code"][0]["code"] == expected