# Tiny Jest

Minimalistic library to run Jest-like tests in any JS environment: browser, node or even deno.
Perfect to run in sandboxes

## Features

- Zero dependency
- Ultra fast
- Clean Jest-like api
- Runs in browser
- Provides jest-like "expect" library, but can be used with any assert/expect library

## Limitations

- Doesn't include cli-runner
- Included "expect" library has limited amount of matchers, much less than original Jest expect

## Installation

### NPM:

```
yarn add tiny-jest
```

or

```
npm install tiny-jest
```

### CDN:

```html
<script src="https://unpkg.com/tiny-jest/dist/bundle.js"></script>
```

### Deno:

```js
import {
  Test,
  expect,
  prettify,
} from "https://raw.githubusercontent.com/ValeriaVG/tiny-jest/v1.2.1/dist/mod.ts";

const { it, run, title } = new Test("basic");

it("2+2=4", () => {
  expect(2 + 2).toBe(4);
});

run().then(prettify);
```

## Usage

For benchmarks and usage examples see `benchmark` folder.

```js
const { it, run, title, before, after } = new Test("name-of-your-test");

before(async () => {
  // some setup
});
before(async () => {
  // some cleanup
});

it("toBe", () => {
  expect(2 + 2).toBe(4);
  expect(2 + 2).not.toBe(5);
});

it("toEqual", () => {
  expect(2 + 2).toEqual("4");
  expect(2 + 2).not.toEqual("5");
});

it("toBeTruthy", () => {
  expect(0).toBeFalsy();
  expect(1).not.toBeFalsy();
});

it("toBeFalsy", () => {
  expect(1).toBeTruthy();
});

it("toMatchObject", () => {
  expect({
    fullName: {
      givenName: "John",
      familyName: "Doe",
    },
  }).toMatchObject({
    fullName: {
      givenName: "John",
    },
  });
  expect({
    givenName: "John",
    familyName: "Doe",
  }).not.toMatchObject({
    fullName: {
      givenName: "John",
    },
  });
});

run().then(prettify);
```