[Unit Testing + Jest + Node server] Testing a Node middleware with Jest

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Code:

import {UnauthorizedError} from 'express-jwt'

function errorMiddleware(error, req, res, next) {
  if (res.headersSent) {
    next(error)
  } else if (error instanceof UnauthorizedError) {
    res.status(401)
    res.json({code: error.code, message: error.message})
  } else {
    res.status(500)
    res.json({
      message: error.message,
      // we only add a `stack` property in non-production environments
      ...(process.env.NODE_ENV === 'production' ? null : {stack: error.stack}),
    })
  }
}

export default errorMiddleware

Test:

• Function have been called with
• Function have been called Times
• Function have not been called

import {UnauthorizedError} from 'express-jwt'
import errorMiddleware from '../error-middleware'

// 

	

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