Redux form test using jest - reactjs

Question

I am trying to test redux form submit for some code similar to this file.
https://github.com/marmelab/admin-on-rest/blob/master/src/mui/auth/Login.js
My code is like this
const middlewares = [];
const mockStore = configureMockStore(middlewares);
it("submit button", () => {
userLogin = jest.fn();
const initialState = {
admin: {
notification: {
text: "",
type: "info"
}
},
};
store = mockStore(initialState);
tn = label => label;
const props = {
submitting: false,
theme: customTheme,
translate: tn,
store,
location: {
state: {
nextPathname: "/"
}
},
userLogin: userLogin
};
container = mount(
<Provider store={store}>
<TranslationProvider locale="en">
<Login {...props} /> //Login is connected component
</TranslationProvider>
</Provider>
,
{
context: { store: mockStore(initialState) }
}
);
const username = container.find("TextField").first();
username.simulate("change", { target: { value: "admin" } });
const password = container.find("TextField").last();
password.simulate("change", { target: { value: "Superuser" } });
const form = container.find("form");
form.simulate("submit");
console.log(username.debug());
expect(userLogin).toHaveBeenCalled();
});
I face two problems.
When I print the username then I dont see the update value that I update through simulate.
Secondly, the expect clause fails. How do I ensure that userLogin function in my code got called.
Expected mock function to have been called.

Answer 1

This is how I test my redux-forms using JEST snapshot testing.
import React from 'react'
import renderer from 'react-test-renderer'
import { createStore } from 'redux'
import { Provider } from 'react-redux'
import YourReduxFormComponent from 'path where it sitting in your project'
import { reduxForm } from 'redux-form'
jest.mock('react-dom')
const spy = jest.fn()
const initialStateValues = {/* initial state values that your form component expects */}
const Decorated = reduxForm({
form: 'testForm', onSubmit: { spy }
})(YourReduxFormComponent)
const formFieldValues = {/*Form field values*/}
it('YourReduxFormComponent renders correctly', () => {
const store = createStore((state) => state, initialStateValues)
const tree = renderer.create(
<Provider store={store}>
<Decorated
{...formFieldValues}
/>
</Provider>
).toJSON()
expect(tree).toMatchSnapshot()
})
//Make your own tests like above to test the values