redux unit testing Store.dispatch()

i have a basic react component like this.

import React from 'react';
import store from 'src/home/store';
class PageLoading extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            message: this.props.message
        };
    }

    componentDidMount(){
        store.dispatch({ type: 'SET_NOTIFICATION_DIALOG', status: '200', message: this.state.message, model: 'LOADING' });
    }

    render(){
        return(<div />);
    }
}


export default PageLoading;

how to unit this component ..?

i am using karma with ezyme. i have written this below code but this is not working

import configureMockStore from 'redux-mock-store';
import PageLoading from 'src/home/components/PageLoading';

const middlewares = [];
const mockStore = configureMockStore(middlewares);

Enzyme.configure({ adapter: new Adapter() });

describe("Page Loading",()=>{
    it("testing shoul dispatch action on calling componentdid mount",()=>{
        const initialState = {}
        const store = mockStore(initialState)
        const wrapper = mount(<PageLoading message="loading"/>);
         const actions = store.getActions();
        const expectedPayload = {type: 'SET_NOTIFICATION_DIALOG', status: '200', message:"loading", model: 'LOADING' };
         expect(actions).toEqual([expectedPayload])
    })
})

i think it is not getting the store.

First, you should provide the store at the top of your app heirarchy.

Use connect to connect to the store and inject dispatch in your component props:

import React from 'react';
import { connect } from 'react-redux';

class PageLoading extends React.Component {
    constructor(props) {
        super(props);
        this.state = {
            message: this.props.message
        };
    }

    componentDidMount(){
        this.props.dispatch({ type: 'SET_NOTIFICATION_DIALOG', status: '200', message: this.state.message, model: 'LOADING' });
    }

    render(){
        return(<div />);
    }
}

export default connect()(PageLoading);

In your test, you can substitute the store for the connected component by passing it as a prop:

describe("Page Loading",()=>{
    it("testing shoul dispatch action on calling componentdid mount",()=>{
        const initialState = {}
        const store = mockStore(initialState)
        const wrapper = mount(<PageLoading store={store} message="loading"/>);
         const actions = store.getActions();
        const expectedPayload = {type: 'SET_NOTIFICATION_DIALOG', status: '200', message:"loading", model: 'LOADING' };
         expect(actions).toEqual([expectedPayload])
    })
})