Test case utility for supertests, featuring a dirty monkey patch for printing response body when expect() fails.

testUtil.js

/*
 *  Inspired by a patch by github.com/RyanMcDonald.
 *  https://github.com/visionmedia/supertest/issues/367#issuecomment-250627577
 *  No rights reserved. :)
 */
const request = require('supertest')


let oldAssertStatus = null


module.exports = {

    patchExpect(){
        if(oldAssertStatus)  return
        // noinspection JSUnresolvedVariable
        oldAssertStatus = request.Test.prototype._assertStatus
        // noinspection JSUnresolvedVariable
        request.Test.prototype._assertStatus = function (status, res) {
            let result = oldAssertStatus(status, res)
            if(result instanceof Error && typeof res.body == 'object'){
                result.message += `. Response body: \'${JSON.stringify(res.body)}\'`
            }
            return result
        }
    },

    unpatchExpect(){
        // noinspection JSUnresolvedVariable
        request.Test.prototype._assertStatus = oldAssertStatus
        oldAssertStatus = null
    }

}