twelvetet/src/__tests__/index.spec.js

A minimalistic twelve-tone equal temperament libray for Javascript

import TwelveTet from '../index'
import Pitch from '../Pitch'

it('should be a function', () => {
    expect(typeof TwelveTet).toBe('function')
})

it('should be a constructor', () => {
    expect(new TwelveTet() instanceof TwelveTet).toBe(true)
})

describe('pitch', () => {
    let twelvetet

    beforeEach(() => {
        twelvetet = new TwelveTet()
    })

    it('should be a function', () => {
        expect(typeof twelvetet.pitch).toBe('function')
    })

    it('should return an instance of Pitch', () => {
        expect(twelvetet.pitch(440) instanceof Pitch).toBe(true)
    })

    it('should normalize input frequency', () => {
        const pitch = twelvetet.pitch(438)
        expect(+pitch).toBe(440)
        expect(pitch.offset()).not.toBe(0)
    })

    it('should accept a pitch', () => {
        const pitch = twelvetet.pitch(twelvetet.pitch(438))
        expect(+pitch).toBe(440)
        expect(pitch.offset()).not.toBe(0)
    })

    it('should accept scientific pitch notation', () => {
        const pitch = twelvetet.pitch('A4')
        expect(+pitch).toBe(440)
    })
})