on_stubbing (Mocha::Mockery)

        # File lib/mocha/mockery.rb, line 85
    85:     def on_stubbing(object, symbol)
    86:       on_stubbing_non_existent_method(object, symbol) unless object.method_exists?(symbol, include_public_methods = true)
    87:       on_stubbing_non_public_method(object, symbol) if object.method_exists?(symbol, include_public_methods = false)
    88:       on_stubbing_method_on_non_mock_object(object, symbol)
    89:     end