Jest Testing with require modules: ejs-loader - node.js

Question

I am playing with the idea of having large static html bundles just loaded into a react component vice typing them all out in jsx. I am currently just experimenting with ejs-loader and html-react-parser to evaluate the feasibility of this. Everything actually renders fine but I cannot get any tests to work with jest for this.
I receive: Cannot find module ejs-loader!./AboutPage.view.ejs from AboutPage.js errors and I am unsure of what to do.
I am currently just working off of react-slingshot as my base for experimenting with this.
The repo for the project is here
The component itself is simple:
import React from 'react';
import Parser from 'html-react-parser';
import '../styles/about-page.css';
const view = require('ejs-loader!./AboutPage.view.ejs')();
// Since this component is simple and static, there's no parent container for it.
const AboutPage = () => {
return (
<div>
{Parser(view)}
</div>
);
};
export default AboutPage;
And the test is:
import React from 'react';
import {shallow} from 'enzyme';
import AboutPage from './AboutPage';
describe('<AboutPage />', () => {
it('should have a header called \'About\'', () => {
const wrapper = shallow(<AboutPage />);
const actual = component.find('h2').text();
const expected = 'About';
expect(actual).toEqual(expected);
});
});
I have read through the docs and similar questions like this. I attempted to use a custom transformer, but I may be misunderstanding something as it doesn't appear to be even called.
Package.json
"jest": {
"moduleNameMapper": {
"\\.(css|scss)$": "identity-obj-proxy",
"^.+\\.(gif|ttf|eot|svg|woff|woff2|ico)$": "<rootDir>/tools/fileMock.js"
},
"transform": {
"^.+\\.js$": "babel-jest",
"\\.(ejs|ejx)$": "<rootDir>/tools/ejx-loader/jest.transformer.js"
}
},
and the transformer itself:
module.exports = {
process(src, filename, config, options){
console.log('????');
return 'module.exports = ' + require(`ejs-loader!./${filename}`);
//return require(`ejs-loader!./${filename}`);
}
};

Answer 1

Can you try changing module name mapper to -
{
"\\.(css|scss)$": "identity-obj-proxy",
"^.+\\.(gif|ttf|eot|svg|woff|woff2|ico)$": "<rootDir>/tools/fileMock.js"
"ejs-loader!(.*)": "$1",
}
This should at least invoke your custom transformer.
Also the custom transformer should be -
const _ = require('lodash');
module.exports = {
process(src, filename, config, options){
console.log('????');
return 'module.exports = ' + _.template(src);
}
};

Answer 2

It doesn't look like you've specified .ejs as a moduleFileExtension.
"jest": {
...
"moduleFileExtensions": ["js", "jsx", "ejs", "ejx"],
...
}
Also, ejs-loader will export the function using cjs syntax for you, so you can do the following in your transformer:
const loader = require('ejs-loader');
module.exports = {process: loader};

Answer 3

Work for me:
"jest": {
"moduleNameMapper": {
'\\.(ejs|ejx)$': '<rootDir>/jest-ejs.transformer.js'
},
moduleFileExtensions: ['js', 'json', 'jsx', 'ejs']
},
In jest-ejs.transformer.js
const loader = require('ejs-loader');
module.exports = {process: loader};