Test Setup Example

modules.spec.js

/* eslint-env node, mocha, chai, chai-spies */
/* eslint max-nested-callbacks: ["error", 6] */

import chai from 'chai';
import spies from 'chai-spies';

import {
    mapObjIndexed,
} from 'ramda';

import './modules';

import {buildSpy, clearDOM, resetAllSpies} from 'sbg-storyline-sdk/util/chaiTestUtil';

chai.use(spies);

// eslint-disable-next-line max-statements
describe('modules', () => {
    const name = 'immaname',
        version = 'immaversion',
        current = 'immacurrent',
        plugin = {
            plugin: name,
            version,
        },
        registryPlugin = {
            ...plugin,
            current,
            version: undefined,
        };

    let element, fetchMod, modules;

    before(() => {
        // Create spies for all imports
        fetchMod = buildSpy([], {
            fetchJson: () => Promise.resolve({
                plugins: {
                    [name]: registryPlugin,
                },
            }),
        });
        require('sbg-util/dist/es/fetch');
        require.cache[require.resolve('sbg-util/dist/es/fetch')] = {
            exports: {
                default: fetchMod,
                fetch: fetchMod,
                ...fetchMod,
            },
        };

        element = buildSpy([], {
            create (tagName, {src, id, ...attrs}) {
                const tag = document.createElement(tagName);
                tag.src = src;
                tag.id = id;
                mapObjIndexed((val, key) => tag.setAttribute(key, val), attrs);
                return tag;
            },
            remove: el => el.remove(),
        });
        require('sbg-util/dist/es/element');
        require.cache[require.resolve('sbg-util/dist/es/element')] = {
            exports: {
                default: element,
                element,
                ...element,
            },
        };

        // Get a fresh instance and use es5 syntax to avoid Babel's hoisting
        delete require.cache[require.resolve('./modules')];
        modules = require('./modules');
    });

    after(() => {
        clearDOM();

        delete require.cache[require.resolve('./modules')];
        delete require.cache[require.resolve('sbg-util/dist/es/fetch')];
        delete require.cache[require.resolve('sbg-util/dist/es/element')];
    });

    beforeEach(clearDOM);

    beforeEach(() => resetAllSpies(
        fetchMod,
        element
    ));
});