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AppProvider.test.tsx
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AppProvider.test.tsx
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import React, {useContext} from 'react';
import {matchMedia} from '@shopify/jest-dom-mocks';
import {mountWithAppProvider} from 'test-utilities/legacy';
import {mountWithApp} from 'test-utilities/react-testing';
import {MediaQueryProvider} from 'components/MediaQueryProvider';
import {LinkContext} from '../../../utilities/link';
import {AppProvider} from '../AppProvider';
describe('<AppProvider />', () => {
beforeEach(() => {
matchMedia.mock();
});
afterEach(() => {
matchMedia.restore();
});
it('updates context when props change', () => {
const Child: React.SFC = () => {
return useContext(LinkContext) ? <div id="child" /> : null;
};
const LinkComponent = () => <div />;
const wrapper = mountWithAppProvider(
<AppProvider i18n={{}}>
<Child />
</AppProvider>,
);
expect(wrapper.find('#child')).toHaveLength(0);
wrapper.setProps({linkComponent: LinkComponent});
wrapper.update();
expect(wrapper.find('#child')).toHaveLength(1);
});
it('renders a MediaProvider', () => {
const appProvider = mountWithApp(
<AppProvider i18n={{}}>
<div>Child</div>
</AppProvider>,
);
expect(appProvider).toContainReactComponent(MediaQueryProvider);
});
});