myass

MY ASSertion framework. Magic free. 0 Dependencies.

---

• How to install
• Features
• Usage
• API

---

Install

npm install myass

Features

• Asynchronous
• Incredibly lightweight
• 0 dependencies
• No fancy features, focus on assertions
• Simple and beautiful output
• Fail fast

Usage

You can use all the methods that the native assert has (see docs) but there are some additional functions available.

Create one of this entry points for your tests:

• test.js
• tests.js
• test/index.js
• tests/index.js

const test = require('myass')
 
test('True is equals to true', async (t) => {
  t.is(true, true)
})
 
test('True is never equal to false', async (t) => {
  t.notEqual(true, false)
})
 
test('Objects are equal even tho properties are shuffled', async (t) => {
  t.is({ foo: 'bar', bar: 'foo' }, { bar: 'foo', foo: 'bar' })
})
 
test('This one throws', async (t) => {
  t.throws(() => t.is(1, 1))
})
 
test('This will throw too', async (t) => {
  t.throws(() => {
    throw new Error()
  })
})

myass is also a cli, so you can just call it like this:

"scripts": {
  "test": "myass"
}

Another cool feature is that myass runs tests like a script, so you can execute the file directly node test.js and it would still work.

API

If you use typescript, myass has typings!

The module is a function that takes a name and a test function:

myass(name, (t) => {})

name: string

This argument is the name of the test you are about to provide. It will be shown in the output whenever that test fails or succeeds.

t: object

I named it t but you can use whatever name you want for this argument. It contains all the necessary functions to run your assertions. As mentioned, you can use all the available functions in node's assert module. myass also provides some helpers that makes it easier to code:

t.is(value, expected)

Shortcut for deepStrictEqual.

test('Objects are equal', async (t) => {
  t.is({ foo: 'bar' }, { foo: 'bar' }) // passes
})

t.true(value) or t.false(value)

Passes if value is true or false. Notice that it has to be true, not truthy.

test('True is true', async (t) => {
  t.true(true) // passes
})
test('False is false', async (t) => {
  t.false(false) // passes
})

t.regex(value, regex) or t.regex(regex, value)

Checks if given value matches the given regex.

test('Matches regex', async (t) => {
  t.regex('abcdef', /abcdef/) // passes
  t.regex(new RegExp('foo'), 'bar') // won't pass
})

There's also t.notRegex to test a string NOT to match a regular expression.

License

MIT

Author

Pablo Varela