Increase test coverage

src/rechunk_data/_rechunk.py

@@ -44,7 +44,9 @@ def _save_dataset(
     logger.debug("Saving file ot %s", str(file_name))
     try:
         dset.to_netcdf(
-            file_name, engine=engine, encoding=encoding,
+            file_name,
+            engine=engine,
+            encoding=encoding,
         )
     except Exception as error:
         logger.error("Saving to file failed: %s", str(error))
@@ -70,7 +72,10 @@ def _rechunk_dataset(dset: xr.Dataset) -> Tuple[xr.Dataset, Dict[str, Any]]:
             continue
         dset[var] = dset[var].chunk(dict(zip(dset[var].dims, new_chunks)))
         logger.debug(
-            "%s: old chunk size: %s, new chunk size: %s", var, old_chunks, new_chunks,
+            "%s: old chunk size: %s, new chunk size: %s",
+            var,
+            old_chunks,
+            new_chunks,
         )
         logger.debug("Settings encoding of variable %s", var)
         encoding[var] = {str(k): v for k, v in dset[var].encoding.items()}