Check if config file exists when running unit tests.

Author: mfeurer

openml/apiconnector.py

@@ -237,6 +237,8 @@ def _parse_config(self):
                     'private_directory': os.path.expanduser('~/.openml/private')}
 
         config_file = os.path.expanduser('~/.openml/config')
+        # Save the config file to check its existence at test time
+        self.config_file = config_file
         config = configparser.RawConfigParser(defaults=defaults)
 
         if not os.path.exists(config_file):

tests/test_apiconnector.py

@@ -43,6 +43,10 @@ def setUp(self):
         self.connector = APIConnector(cache_directory=self.workdir)
         print(self.connector._session_hash)
 
+        if not os.path.exists(self.connector.config_file):
+            raise Exception("OpenML config file required to run unit tests. "
+                            "See https://github.com/openml/OpenML/wiki/Client-API")
+
     def tearDown(self):
         os.chdir(self.cwd)
         shutil.rmtree(self.workdir)