def METHOD_NAME(self):
    # Clear existing values
    self.user.clear_config("a")
    self.user.clear_config("b.foo")
    self.assertTrue("a" not in self.user.config_data)
    self.assertTrue("foo" not in self.user.config_data["b"])
    self.assertEqual(self.user.config_data["b"]["bar"], 102)
    # Clear a non-existing value; should fail silently
    self.user.clear_config("invalid")