woocommerce/tests/e2e/config/jest.setup.js

import {
	clearLocalStorage,
	setBrowserViewport,
	withRestApi,
	WP_ADMIN_LOGIN
} from '@woocommerce/e2e-utils';

const config = require('config');
const { HTTPClientFactory } = require('@woocommerce/api');

/**
 * Uses the WordPress API to delete all existing posts
 */
async function trashExistingPosts() {
	const apiUrl = config.get('url');
	const wpPostsEndpoint = '/wp/v2/posts';
	const adminUsername = config.get('users.admin.username');
	const adminPassword = config.get('users.admin.password');
	const client = HTTPClientFactory.build(apiUrl)
		.withBasicAuth(adminUsername, adminPassword)
		.create();

	// List all existing posts
	const response = await client.get(wpPostsEndpoint);
	const posts = response.data;

	// Delete each post
	for(const post of posts){
		await client.delete(`${wpPostsEndpoint}/${post.id}`);
	}

}

// Before every test suite run, delete all content created by the test. This ensures
// other posts/comments/etc. aren't dirtying tests and tests don't depend on
// each other's side-effects.
beforeAll( async () => {
	await trashExistingPosts();
	await withRestApi.deleteAllProducts();
	await withRestApi.deleteAllCoupons();
	await page.goto(WP_ADMIN_LOGIN);
	await clearLocalStorage();
	await setBrowserViewport( 'large' );
} );