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supertest-capture-error
Advanced tools
This plugin allows you to capture and modify an assertion error that occured in a test.
Typical use case is to provide more debugging information when your assertion has failed.
npm i -D supertest-capture-error
Let's use the plugin to add request url and response body information to error messages:
const supertest = require('supertest');
const use = require('superagent-use'); // so that we can apply capturing for each request
const captureError = require('supertest-capture-error');
// apply capturing for each request
const request = use(supertest('http://localhost'));
.use(captureError((error, test) => {
// modify error message to suit our needs:
error.message += ` at ${test.url}\n` +
`Response Body:\n${test.res.text}`;
error.stack = ''; // this is useless anyway
}));
Now, let's say that we're using Mocha and testing user creation endpoint. Our server expect user name and password, and will respond with validation error if something went wrong. Here's how we use Supertest:
request
.post('/users')
.send({name: 'john'})
.set('Accept', 'application/json')
.expect(201)
.end(done);
Results,
without the plugin:
Error: expected 201 "Created", got 422 "Unprocessable Entity"
at Test._assertStatus (node_modules/supertest/lib/test.js:268:12)
at Test._assertFunction (node_modules/supertest/lib/test.js:283:11)
at Test.assert (node_modules/supertest/lib/test.js:173:18)
at assert (node_modules/supertest/lib/test.js:131:12)
at node_modules/supertest/lib/test.js:128:5
at Test.Request.callback (node_modules/superagent/lib/node/index.js:706:12)
at IncomingMessage.parser (node_modules/superagent/lib/node/index.js:906:18)
at endReadableNT (_stream_readable.js:1064:12)
at _combinedTickCallback (internal/process/next_tick.js:138:11)
at process._tickCallback (internal/process/next_tick.js:180:9)
with the plugin:
Error: expected 201 "Created", got 422 "Unprocessable Entity" at http://localhost/users
Response Body:
You need to pass the "password" field as well
test
object that gets passed into the plugin is quite huge and contains full request, response and
some additional Supertest data. I encourage you to inspect its properties. You can use all of that to enhance your debugging experience.
FAQs
Supertest plugin for capturing errors
The npm package supertest-capture-error receives a total of 603 weekly downloads. As such, supertest-capture-error popularity was classified as not popular.
We found that supertest-capture-error demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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