@humanfs/test

by Nicholas C. Zakas

If you find this useful, please consider supporting my work with a donation or nominate me for a GitHub Star.

Description

Testing utilities for humanfs.

[!WARNING] This project is experimental and may change significantly before v1.0.0. Use at your own caution and definitely not in production!

Installation

Node.js

Install using your favorite package manager for Node.js:

npm install @humanfs/test

# or

pnpm install @humanfs/test

# or

yarn add @humanfs/test

# or

bun install @humanfs/test

Then you can import the Hfs and Path classes like this:

import { HfsImplTester } from "@humanfs/test";

Deno

For Deno, set up a deno.json file like this:

{
    "imports": {
        "@humanfs/test": "npm:@humanfs/test@latest"
    }
}

Then you can import the Hfs class like this:

import { HfsImplTester } from "@humanfs/test";

Browser

It's recommended to import the minified version to save bandwidth:

import { HfsImplTester } from "https://cdn.skypack.dev/@humanfs/test?min";

However, you can also import the unminified version for debugging purposes:

import { HfsImplTester } from "https://cdn.skypack.dev/@humanfs/test";

Usage

Prerequisites

At a minimum, an impl must implement these methods to use HfsImplTester:

• bytes()
• createDirectory()
• deleteAll()
• isDirectory()
• isFile()
• write()

The HfsImplTester Class

The HfsImplTester class contains built-in testing for impls to ensure that they comply with the HfsImpl interface. This class is testrunner agnostic, and you must provide a directory to work in, the equivalent of describe and it, and an assertion library, in order for it work correctly. Here's an example for Node.js:

// Node.js
import { describe, it, beforeEach, afterEach } from "node:test";
import assert from "node:assert";
import path from "node:path";

const tester = new HfsImplTester({
    outputDir: path.resolve(process.cwd(), ".hfs-tests"),
    assert,
    test: {
        describe,
        it,
        beforeEach,
        afterEach
    }
});

For Deno, you'll need to import the relevant modules and assign them to match the Node.js APIs, such as:

import {
    describe,
    it,
    beforeEach,
    afterEach,
} from "https://deno.land/std/testing/bdd.ts";
import {
    assert,
    assertEquals,
    assertObjectMatch,
    assertRejects,
} from "https://deno.land/std/assert/mod.ts";
import * as path from "https://deno.land/std/path/mod.ts";

const tester = new HfsImplTester({
    outputDir: path.resolve(Deno.cwd(), ".hfs-tests"),
    assert: {
        strictEqual: assertEquals,
        deepStrictEqual: assertObjectMatch,
        rejects: assertRejects,
        ok: assert,
    },
    test: {
        describe,
        it,
        beforeEach,
        afterEach,
    },
});

Once set up, you can run the tests like this:

await tester.test({
    name: "Name to show up in test output",
    impl: new MyImpl()
});

The HfsImplTester will only run tests for the minimum required methods plus any additional interface methods found.

License

Apache 2.0