redux-devtools/packages/redux-devtools-app/test/app.spec.tsx

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import React from 'react';
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import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import { render, screen, within } from '@testing-library/react';
import App from '../src/containers/App';
import api from '../src/middlewares/api';
import exportState from '../src/middlewares/exportState';
import rootReducer from '../src/reducers';
import { DATA_TYPE_KEY } from '../src/constants/dataTypes';
import stringifyJSON from '../src/utils/stringifyJSON';
Object.defineProperty(window, 'matchMedia', {
writable: true,
value: jest.fn().mockImplementation((query) => ({
matches: false,
media: query,
onchange: null,
addListener: jest.fn(), // deprecated
removeListener: jest.fn(), // deprecated
addEventListener: jest.fn(),
removeEventListener: jest.fn(),
dispatchEvent: jest.fn(),
})),
});
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const store = createStore(rootReducer, applyMiddleware(exportState, api));
describe('App container', () => {
it("should render inspector monitor's wrapper", () => {
render(
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<Provider store={store}>
<App />
</Provider>
);
expect(screen.getByTestId('inspector')).toBeDefined();
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});
it('should contain an empty action list', () => {
render(
<Provider store={store}>
<App />
</Provider>
);
const actionList = screen.getByTestId('actionList');
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expect(
within(actionList).getByTestId('actionListRows')
).toBeEmptyDOMElement();
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});
});
describe('stringifyJSON', () => {
it('should not mutate the source object', () => {
const src = {
isTest: true,
[DATA_TYPE_KEY]: 'Test',
};
const result = {
data: {
isTest: true,
},
__serializedType__: 'Test',
};
expect(stringifyJSON(src, true)).toEqual(JSON.stringify(result));
expect(src).toEqual({
isTest: true,
[DATA_TYPE_KEY]: 'Test',
});
});
});