Fix openapi fixture usage

This should also be applied to master

tests/test_api.py

@@ -406,7 +406,7 @@ def test_api_exception(config, api_):
  assert code == HTTPStatus.BAD_REQUEST
 
 
-def test_gzip(config, api_):
+def test_gzip(config, api_, openapi):
  # Requests for each response type and gzip encoding
  req_gzip_json = mock_request(HTTP_ACCEPT=FORMAT_TYPES[F_JSON],
  HTTP_ACCEPT_ENCODING=F_GZIP)
@@ -501,7 +501,7 @@ def test_gzip(config, api_):
  gzip.decompress(rsp_gzip_html).decode(enc_16)
 
 
-def test_gzip_csv(config, api_):
+def test_gzip_csv(config, api_, openapi):
  req_csv = mock_request({'f': 'csv'})
  rsp_csv_headers, _, rsp_csv = api_.get_collection_items(req_csv, 'obs')
  assert rsp_csv_headers['Content-Type'] == 'text/csv; charset=utf-8'
@@ -1165,7 +1165,7 @@ def test_manage_collection_item_read_only_options_req(config, api_):
  assert rsp_headers['Allow'] == 'HEAD, GET'
 
 
-def test_manage_collection_item_editable_options_req(config):
+def test_manage_collection_item_editable_options_req(config, openapi):
  """Test OPTIONS request on a editable items endpoint"""
  config = copy.deepcopy(config)
  config['resources']['obs']['providers'][0]['editable'] = True