While I have primarily used Jasmine for tests in the past, I am now experimenting with Jest. However, I have encountered an issue where classes like FileReader, File, and TextDecoder are not defined in my tests. How can I incorporate these classes with their actual functionalities to effectively test a class that relies on them?
I was able to find a workaround for the TextDecoder issue thanks to @josephting's suggestion. It's not ideal, as it involves installing a deprecated and unmaintained dev dependency called text-encoding.
To implement this workaround, you first need to define setupFiles in your jest.config.js:
[...]
setupFiles: ['./tests/setupEnv.js'],
[...]
You also have to globally require the mentioned package in your setupEnv.js:
TextDecoder = require('text-encoding').TextDecoder;
After some troubleshooting, I managed to find a solution for this issue by including TextEncoder and TextDecoder as global variables in my Jest configuration.
To implement this fix, I updated my jest.config file with the following code:
const { TextDecoder, TextEncoder } = require('util')
module.exports = {
globals: {
TextDecoder: TextDecoder,
TextEncoder: TextEncoder,
}
}
For those utilizing Jest, a helpful solution is provided by Arthur Medeiros: Simply grant jest access to the necessary global variables it requires. It's worth noting that there may not be a need to import util since TextDecoder and TextEncoder should already be available in the global scope within your jest configuration file; all you require is
globals: { TextDecoder, TextEncoder },However, there might be instances where you prefer not to include these globals for every test in your suite (and don't wish to create another config file), or are working with something other than jest. In such scenarios, you can easily add this to your test file:
import { TextDecoder, TextEncoder } from 'node:util'; // (ESM style imports)
global.TextDecoder = TextDecoder;
global.TextEncoder = TextEncoder;
// Proceed with your desired actions... (for me, it involved using node-fetch)
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