I have an interesting error in testing my component and don't now to fix(
I use jest, enzyme, react, redux.
In front end part of the app all is working correctly.
What error I can see now:
● Body Component › Body Component is loading › Is loading
Invariant Violation: Could not find "store" in the context of "Connect(Body)". Either wrap the root component in a <Provider>, or pass a custom React context provider to <Provider> and the corresponding React context consumer to Connect(Body) in connect options.
25 | };
26 |
> 27 | const BodyComponent = shallow(<Body />);
| ^
28 | });
29 | });
30 | });
my setupTests.js:
import Enzyme, { shallow, render, mount } from "enzyme";
import Adapter from "enzyme-adapter-react-16";
//import toJson from 'enzyme-to-json'
// React 16 Enzyme adapter
Enzyme.configure({ adapter: new Adapter() });
global.shallow = shallow;
global.render = render;
global.mount = mount;
//global.toJson = toJson
// Fail tests on any warning
console.error = message => {
throw new Error(message);
};
My Test for component:
import React from "react";
import Body from "./Body";
import { shallow, render, mount } from "enzyme";
describe("Body Component", () => {
const props = {
data: {
time: undefined,
products: [],
filteredProducts: [],
search: undefined
}
};
describe("Body Component is loading", () => {
it("Is loading", () => {
const nextProps = {
...props,
data: {
products: [{}, {}],
filteredProducts: [{ name: "sdffd" }, { name: "sdf" }],
search: "sdf"
}
};
const BodyComponent = shallow(<Body />);
});
});
});
Also I can send my component:
import React from "react";
import ProductListItem from "./ProductListItem";
import { connect } from "react-redux";
const names = ["Seattle", "Bellevue", "Tacoma", "Puyallup"];
const Body = props => {
const { products, filteredProducts, search } = props;
console.log("FILTERED IN BODY", filteredProducts);
console.log(products);
return (
<div className="main">
{names.map(name => (
<ProductListItem
name={name}
data={search ? filteredProducts : products}
key={Math.random()}
/>
))}
</div>
);
};
const mapStatesToProps = state => {
return {
products: state.data.products,
filteredProducts: state.data.filteredProducts,
search: state.data.search
};
};
export default connect(mapStatesToProps)(Body);
Can somebody tell me what I do incorrectly? I think something is wrong with {shallow}. Maybe someone knows how to fix this error?
Thank you so much!
You need to create a mocked store and pass it to the component as its props. connect(mapStatesToProps)(Body) statement will create a wrapped component. So you need to use wrapper.find(Body) of enzyme to get the Body stateless functional component.
index.tsx:
import React from 'react';
import ProductListItem from './ProductListItem';
import { connect } from 'react-redux';
const names = ['Seattle', 'Bellevue', 'Tacoma', 'Puyallup'];
export const Body = props => {
const { products, filteredProducts, search } = props;
console.log('FILTERED IN BODY', filteredProducts);
console.log(products);
return (
<div className="main">
{names.map(name => (
<ProductListItem name={name} data={search ? filteredProducts : products} key={Math.random()} />
))}
</div>
);
};
const mapStatesToProps = state => {
return {
products: state.data.products,
filteredProducts: state.data.filteredProducts,
search: state.data.search
};
};
export default connect(mapStatesToProps)(Body);
index.spex.tsx:
import React from 'react';
import ConnectedBody, { Body } from './';
import { shallow } from 'enzyme';
import configureMockStore from 'redux-mock-store';
const initialState = {
data: {
time: undefined,
products: [],
filteredProducts: [],
search: undefined
}
};
const mockStore = configureMockStore();
const store = mockStore(initialState);
describe('Body Component', () => {
const props = {
data: {
time: undefined,
products: [],
filteredProducts: [],
search: undefined
}
};
describe('Body Component is loading', () => {
it('Is loading', () => {
const nextProps = {
...props,
data: {
products: [{}, {}],
filteredProducts: [{ name: 'sdffd' }, { name: 'sdf' }],
search: 'sdf'
}
};
const wrapper = shallow(<ConnectedBody store={store} />);
const BodyComponent = wrapper.find(Body);
expect(BodyComponent.prop('products')).toEqual(props.data.products);
expect(BodyComponent.prop('filteredProducts')).toEqual(props.data.filteredProducts);
expect(BodyComponent.prop('search')).toEqual(props.data.search);
});
});
});
Unit test result:
PASS src/stackoverflow/57942218/index.spec.tsx
Body Component
Body Component is loading
✓ Is loading (37ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 4.771s, estimated 5s
Here is the completed demo: https://github.com/mrdulin/jest-codelab/tree/master/src/stackoverflow/57942218
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