Sandbox::https://github.com/preactjs/preact/blob/main/vitest.setup.js

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import { expect, describe } from 'vitest';

globalThis.context = describe;

window.addEventListener('error', () => {});

// Something that's loaded before this file polyfills Symbol object.

// We need to verify that it works in IE without that.

if (/Trident/.test(window.navigator.userAgent)) {

window.Symbol = undefined;

}

// Fix Function#name on browsers that do not support it (IE).

// Taken from: https://stackoverflow.com/a/17056530/755391

if (!function f() {}.name) {

Object.defineProperty(Function.prototype, 'name', {

get() {

let name = (this.toString().match(/^function\s*([^\s(]+)/) || [])[1];

// For better performance only parse once, and then cache the

// result through a new accessor for repeated access.

Object.defineProperty(this, 'name', { value: name });

return name;

}

});

}

expect.extend({

equalNode: (obj, expected) => {

if (expected == null) {

return {

pass: obj == null,

message: () => `expected node to "== null" but got ${obj} instead.`

};

} else {

return {

pass: obj.tagName === expected.tagName && obj === expected,

message: () =>

`expected node to have tagName ${expected.tagName} but got ${obj.tagName} instead.`

};

}

});