mockire

This library allows developers to stub and clear the require built-in method.

The Mockire interceptor is initialized as soon as the module is required.

Use with caution.

Methods

• match(pattern, value): matches the module path against a regular expression.
• exact(input, value): expects the provided path to be exactly as required.
• clearStubs(): clears all stubs.
• reset(): removes the monkey patch.
• init(): initializes the interceptor.
• clearRequireCache(): clears all modules stored in the require cache. Modules will be loaded again next time require is invoked.

Use cases:

Clearing cache before tests start

const { clearRequireCache } = require('mockire');
let server;
describe('Unit tests', () => {
    before((done) => {
        clearRequireCache();
        server = require('./MyCustomServer');
    })
} 

Loads fake dependencies

const { match } = require('mockire');
match('MyProjectDirectory/config/env/*', { port: 8000, db: { host: 'localhost', port: '27017' } });
const server = require('./MyCustomServer');

describe('Unit tests', () => {
    before((done) => {
        server.start()
    })
} 

Creates virtual dependency

const { exact, clearStubs } = require('mockire');
if (!fs.existsSync('./path/customLib)) {
    exact('./path/customLib', { something });
}
const lib = require('./path/customLib');
await lib.foo();
clearStubs();