Test get_parquet on production server (#1174)

The test server has minio urls disabled. This is because we currently
do not have a setup that represents the live server in a test
environment yet. So, we download from the production server instead.

Author: PGijsbers

tests/test_datasets/test_dataset_functions.py

@@ -1541,7 +1541,10 @@ def test_data_fork(self):
         )
 
     def test_get_dataset_parquet(self):
-        dataset = openml.datasets.get_dataset(20)
+        # Parquet functionality is disabled on the test server
+        # There is no parquet-copy of the test server yet.
+        openml.config.server = self.production_server
+        dataset = openml.datasets.get_dataset(61)
         self.assertIsNotNone(dataset._minio_url)
         self.assertIsNotNone(dataset.parquet_file)
         self.assertTrue(os.path.isfile(dataset.parquet_file))