testamenta
v0.1.1
Published
Lightweight, dependency-free test framework with a **Jest-like public API**. Useful for environments where bundlers and Node.js are not required, it allows you to test JavaScript code directly in the browser via a simple `<script>` import.
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Testamenta
Lightweight, dependency-free test framework with a Jest-like public API. Useful for environments where bundlers and Node.js are not required, it allows you to test JavaScript code directly in the browser via a simple <script>
import.
Key Features
📖 Jest-like API: Offers a public interface very similar to Jest (with its obvious limitations), making it intuitive for users already familiar with popular testing frameworks.
📦 No Setup: Requires no installation or package management—simply import the framework using a script tag.
⏳ Async-Aware: Supports asynchronous test execution via
async/await
.🔍 Mocking: Built-in support for mock functions and call tracking.
📝 Flexible Logging: Outputs results to the console and the DOM.
Getting Started
Copy the testamenta.js
file to your project or import it from a CDN unpkg | jsdelivr.
It can also be installed with npm, but it doesn't make much sense having more complete and robust options like Jest.
// test.html
<script type="module">
import { tests } from 'https://unpkg.com/testamenta';
tests(['utils', 'plugins'], {
path: new URL('.', import.meta.url).href, // path to test files
});
</script>
Create test files named as *.test.js
to be properly loaded. Test files use a syntax similar to Jest.
[!WARNING] The call to
describe
must be awaited to properly run tests sequentially.
import { describe, it, expect } from 'https://unpkg.com/testamenta';
await describe('Math operations', () => {
it('should add two numbers', () => {
expect(1 + 2).toBe(3);
});
});
Both describe
and it
can be asynchronous and use async/await, and skipped by using the skip
modifier.
import { describe, it, expect } from 'https://unpkg.com/testamenta';
await describe('Promises', () => {
it('should await for a Promise', async () => {
const value = await new Promise(resolve => {
setTimeout(() => resolve(1), 1000);
});
expect(value).toBe(1);
});
});
beforeAll
and afterAll
can be used to setup and clean up resources before and after each test in a suite. Returned value in beforeAll is passed as parameter to it and afterAll functions.
Mocking functions is supported, allowing you to simulate and track function calls during test execution.
import { describe, it, expect, beforeAll, mockFn } from 'https://unpkg.com/testamenta';
await describe('Mocking', () => {
const mock = mockFn();
beforeAll(() => mock.reset());
it('should mock a function', () => {
mock(1, 2);
mock(3, 4);
expect(mock)
.toHaveBeenCalledTimes(2);
.toHaveBeenCalledWith(1, 2);
});
})
Assertion
The expect
function allows for assertions within test cases. It provides a wide range of built-in matchers for testing various conditions:
toBe
Asserts strict equality.toBeTruthy
Asserts that a value is truthy.toBeBoolean
,toBeNumber
,toBeString
,toBeArray
,toBeDate
,toBeObject
,toBeFunction
: Type checks for primitives, objects and functions.toHaveLength
: Asserts the length of an array or string.toContain
: Verifies that an array, object or string contains a specific value.toHaveBeenCalled
,toHaveBeenCalledTimes
,toHaveBeenCalledWith
: Matchers for verifying mock function behavior.
All matchers can be negated with the not
modifier.
Multiple assertions can be chained together.
Extend the expect
function to add additional custom matchers to increment testing flexibility.
import { describe, it, expect } from 'https://unpkg.com/testamenta';
expect.extend(({ toBeNumber }) => ({
toBeEven: value => toBeNumber(value) && value % 2 === 0,
}));
await describe('Custom matchers', () => {
it('should assert even numbers', () => {
expect(2).toBeEven();
expect(3).not.toBeEven();
});
});
Development
To run in Node, execute npm run dev
. Test suite will run in terminal in watch mode and will update on each change.
To run in browser, start a Live Server in VSCode.