A simple utility to declare a filesystem test fixture: a directory containing a number of files, used for testing some library or CLI tool.

Note: initially, this utility is not published to npm. You can install it directly from git:

npm i -D https://github.com/TypeStrong/fs-fixture-builder

If necessary, we can publish to npm in the future.

Basic usage

• instantiate a new Project instance, letting it pick a temp directory, or passing a path to a root directory.
• declare a bunch of files in-memory
• use rm to delete the contents of the fixture directory
• use write to write all files into the fixture directory

Depending on your testing style, you may want to call rm in test teardown, or you may want to leave the fixture on disk for manual testing. If the latter, you can call rm immediately before write to reset the fixture every time it runs.

Explicit Resource Management may also be used to automatically call rm on the project when it goes out of scope.

import { tempdirProject } from "@typestrong/fs-fixture-builder";
import { test } from "node:test"

test("Something with the filesystem", () => {
    using project = tempdirProject();
    // project will be cleaned up automatically after the test, even if it fails
})

CLI

The command capture-fs-fixture is provided by this package to traverse a directory and generate code to recreate that directory with this tool. After installing, run npx capture-fs-fixture path/to/dir > out.ts