How to call python function in jquery in odoo 11

Python code:

@api.model
def test_method(self):
    a= 10
    b = 20
    c = a+b
    return c

jQuery:

var Model = require('web.Model');
$(document).ready(function() {
  var test_model = new Model("MyClass");
  test_model.call("test_method").then(function(c) {
    console.log("res ult:" + JSON.stringify(result));
  });
});

Error:

Missing depends,

The above code will is working in odoo 10 but not in odoo 11. I want to know how to call a python function from JS.