https://github.com/opensly/diwar

A simple javascript assertion library for Node.js & browser.
https://github.com/opensly/diwar

Last synced: about 1 year ago
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A simple javascript assertion library for Node.js & browser.

• Host: GitHub
• URL: https://github.com/opensly/diwar
• Owner: opensly
• License: mit
• Created: 2021-10-19T07:27:01.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2022-06-10T17:26:38.000Z (almost 4 years ago)
• Last Synced: 2025-02-01T15:11:28.029Z (over 1 year ago)
• Language: JavaScript
• Homepage:
• Size: 7.81 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# be-assertive

A simple javascript assertion library for Node.js & browser.

(Note: Still under development state)

## How to use?

## Features

#### Matchers

A matcher is a method that lets you test values. The following matchers, compares the value of the result of expect() with the value passed in as argument, are:

- **toBe** compares strict equality, using ===

- **toEqual** compares the values of two variables. If it’s an object or array, it checks the equality of all the properties or elements

- **toBeNull** is true when passing a null value

- **toBeUndefined** is true when passing an undefined value

- **toBeCloseTo** is used to compare floating values, avoiding rounding errors

- **toBeTruthy** true if the value is considered true (like an if does)

- **toBeFalsy** true if the value is considered false (like an if does)

- **toBeGreaterThan** true if the result of expect() is higher than the argument

- **toBeGreaterThanOrEqual** true if the result of expect() is equal to the argument, or higher than the argument

- **toBeLessThan** true if the result of expect() is lower than the argument

- **toBeLessThanOrEqual** true if the result of expect() is equal to the argument, or lower than the argument

- **toBeNaN**

- **toMatch** is used to compare strings with regular expression pattern matching

- **toMatchObject** to check that a JavaScript object matches a subset of the properties of an object.

- **toContain** is used in arrays, true if the expected array contains the argument in its elements set

- **toHaveLength(number)** checks the length of an array

- **toHaveProperty(key, value)** checks if an object has a property, and optionally checks its value

- **toThrow** checks if a function you pass throws an exception (in general) or a specific exception

- **toBeInstanceOf():** checks if an object is an instance of a class.

#### Setup

Before running your tests you will want to perform some initialization.

- beforeAll(), to do something once before all the tests runs

- beforeEach(), to perform something before each test runs

#### Teardown

Just as you can do with setup, you can also perform something after each test runs

- afterEach(), to perform something after each test runs

- afterAll(), to perform something after all the tests runs