def METHOD_NAME(self):
    parameter_values = {"Param1": "value1"}
    sam_template = {"Parameters": {"Param1": {"Type": "String"}, "Param2": {"Type": "String"}}}
    expected = {"Param1": "value1"}
    sam_parameter_values = SamParameterValues(parameter_values)
    sam_parameter_values.add_default_parameter_values(sam_template)
    self.assertEqual(expected, sam_parameter_values.parameter_values)