docstr: Test overriding the rc params dictionary
docstr_tok: ["Test","overriding","the","rc","params","dictionary"]
code: def test_rc_override(self):
      """
      Test overriding the rc params dictionary
      """
      key, val = "grid.linewidth", 5
      rc = {key: val, "foo": "bar"}
      out = yb_rcmod._plotting_context("talk", rc=rc)
      assert out[key] == val
      assert "foo" not in out
  
imports: import pytest
  import numpy
  import matplotlib
  import numpy.testing
  import yellowbrick.style.rcmod
  from tests.base import VisualTestCase
label_desc: Use image node_id 3 for calling the TestPlottingContext obj's underlying member method code with example usage: obj.test_rc_override() without return types