moyal.js.test

A lightweight, dependency-free JavaScript testing utility. This project is framework-agnostic and usable in both browser and Node.js environments.

Information

• Current Version: 2.1.8
• Author: Ilan Moyal
• Website: https://www.moyal.es
• License: MIT
• NPM: https://www.npmjs.com/package/@moyal/js-test
• API Documentation: View online

Table of Contents

• Installation
• Importing
• Features
• Quick Start
• Custom Logger Support
• Exported Modules and Classes
• Version Access
• Example files and test files
• License
• Author

Installation

npm install @moyal/js-test

Importing

In Node.js (ES Module)

import { Test } from "@moyal/js-test";

In Node.js (CommonJS)

const { Test } = require("@moyal/js-test");

In the Browser (ES Module via CDN)

<!-- From jsDelivr CDN (minified version) -->
<script type="module">
  import "https://cdn.jsdelivr.net/npm/@moyal/[email protected]/dist/moyal.test.umd.min.js";
</script>

<!-- From jsDelivr CDN (non minified version with documentation) -->
<script type="module">
  import "https://cdn.jsdelivr.net/npm/@moyal/[email protected]/dist/moyal.test.umd.js";
</script>

Or using unpkg:

<script type="module">
  import "https://unpkg.com/@moyal/[email protected]/dist/moyal.test.umd.min.js";
</script>

Features

• Minimalistic test runner with zero dependencies.
• Works in both browser and Node.js environments.
• Fluent-style test groups for structured assertions.
• Rich console output with color-coded results and grouping.
• Lazy evaluation support for deferred execution (note: not true async test execution).
• Built-in assertion types: equality, throws, null/undefined checks, and sequence comparison.
• Utilities for test numbering and hierarchical auto-numbering.
• Pluggable logger interface with default support for:
  • Browser console
  • Node.js console with indentation and ANSI coloring
  • Fallback printer for unknown environments

Quick Start

See also quick-start folder for the source code of the examples.

import {MultiLevelAutoNumbering, TestGroup} from '@moyal/js-test';

new TestGroup("MLA Numbered Tests")
   .areNotEqual("Validate inequality", 1, 2)
	 .areEqual("Test strings", "foo", "foo")
   .groupStart("Nested test group")
	   .isFalse("This is lie", () => 1 == 2)
	   .areEqual("Test B2", "Hello World!", () => "Hello World!") 
	 .groupClose();
	 .areEqual("Test booleans", true, true)
	 .areEqual("Test C", 123, 123)
	 .run(true, new MultiLevelAutoNumbering());

In this quick start example:

• Test group enable chaining test calls, as well as creating nested test groups.
• Values, functions and lambda expressions are supported for both expected and actual.
• Test is delayed until run is called.
• Passing true to run, print results to the the console; false prints nothing; null or undefined prints only errors.
• Passing an instance of MultiLevelAutoNumbering auto enumerate the tests.

More examples can be found in examples and test/units.

Custom Logger Support

Override console output with your custom logger:

import {Test, LoggerBase} from '@moyal/js-test';
class MyLogger extends LoggerBase {
  /* implement logger methods */
  log(message, color, ...args) { /* ... */}
  info(message, color, ...args) { /* ... */ }
  warn(message, color, ...args) { /* ... */ }
  error(message, color, ...args) { /* ... */ }
  group(label, color) { /* ... */ }
  groupCollapsed(label, color) { /* ... */ }
  groupEnd() { /* ... */ }
}

Test.logger = new MyLogger();  

Note The logger methods are chainable.

Exported Modules and Classes

Testing types

• Test - Contains static method for testing.
• TestBase - Derive your class from TestBase to create custom test.
• Assert - Base class for assertions.
• IsDefined - Asserts that the specified evaluates to defined value.
• IsUndefined - Asserts that the specified evaluates to undefined value.
• IsFalse - Asserts that the specified evaluates to false.
• IsTrue - Asserts that the specified evaluates to false.
• IsNull - Asserts that the specified evaluates to null.
• IsNotNull - Asserts that the specified evaluates to non null value.
• AreEqual - Asserts that the specified values evaluations are equal.
• AreNotEqual - Asserts that the specified values evaluations are not equal.
• ThrowsBase - Base class to test error throwing.
• Throws - Asserts that the specified throws error.
• NoThrows - Asserts that the specified does not throw error.
• SequencesAreEqual - Asserts that the specified sequences are equal.
• TestGroup - Groups and enables chaining of multiple tests.

Utility types:

• SequentialText - Utility class to generate sequential text.
• AutoNumbering - Utility class to generate automatic incremented number.
• MultiLevelAutoNumbering - Utility class to generate automatic incremented number.

Logging types:

• LoggerBase - Base class for logger.
• SimpleLogger - Simple logger for unknown environments.
• BrowserLogger - Console logger for browser.
• NodeLogger - Console logger for NodeJS.

The namespace MoyalTest is also exported which wrapping all these types.

Version Access

Access the library version directly:

import * as myLib from "@moyal/js-test";

myLib.Version // → e.g., "2.1.8"

Example files and test files

Example files can be found under examples folder and/or test/units folder (You can treat these test files as examples)

License

MIT License - free to use, modify, and distribute.

Author

Ilan Moyal Website: https://www.moyal.es

GitHub: Ilan Moyal

LinkedIn: Ilan Moyal