code: def test_get_credentials_file(self):
      # Check get_credentials returns all the keys
  
      original_creds = tools.get_credentials_file()
      expected = [
          "username",
          "stream_ids",
          "api_key",
          "proxy_username",
          "proxy_password",
      ]
      self.assertTrue(all(x in original_creds for x in expected))
  
file_path: plotly.py/packages/python/chart-studio/chart_studio/tests/test_core/test_tools/test_file_tools.py
imports: from chart_studio import tools
  from chart_studio.tests.utils import PlotlyTestCase
  import warnings
label_desc: Use image node_id 7 for calling the FileToolsTest obj's underlying member method code with example usage: obj.test_get_credentials_file() without return types