npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2025 – Pkg Stats / Ryan Hefner

test-value-generator

v1.0.1

Published

Utility functions to generate incremental or unique values in automated tests.

Downloads

2

Readme

test-value-generator

Utilities to generate incremental and unique values in automated tests.

npm version Dependency Status Build Status Coverage Status License

Developed at the Media Engineering Institute (HEIG-VD).

Usage

This module exposes factory functions that return value generator functions when called:

const testValueGenerator = require('test-value-generator');

// Create a value generator function:
const numberGenerator = testValueGenerator.incremental(i => i);
typeof(numberGenerator); // => "function"

// Generate a value by calling it:
numberGenerator(); // => 0

Generating incremental values

const testValueGenerator = require('test-value-generator');

// An incremental value generator helps you produce values containing
// a number that is incremented each time you use the generator.
const incrementalEmail = testValueGenerator.incremental(i => `email-${i}@example.com`);
incrementalEmail(); // => "email-0@example.com"
incrementalEmail(); // => "email-1@example.com"
incrementalEmail(); // => "email-2@example.com"

Generating unique values

A value generator created with unique will call your function until it can generate a value that it has not generated before. It will throw an error if it fails after 10 attempts.

const testValueGenerator = require('test-value-generator');

// A unique value generator makes sure to never produces the same value
// twice, and throws an error if it cannot.
const uniqueDiceRoll = testValueGenerator.unique(() => Math.floor(Math.random() * 6 + 1));
uniqueDiceRoll(); // => 3
uniqueDiceRoll(); // => 5
uniqueDiceRoll(); // => 6
uniqueDiceRoll(); // => 2
uniqueDiceRoll(); // => 1
uniqueDiceRoll(); // => 4
try {
  uniqueDiceRoll();
} catch(err) {
  // Error thrown: Could not generate unique value after 10 attempts.
}