zifferjs/src/test/chords.test.ts

Zifferjs - Typescript variant of Ziffers

import { describe, expect, it } from 'vitest'
import { chord, chordToPcSet, midiToPitchClass, tMatrix, voiceLead} from '../scale.ts'
import { pattern } from '../ziffers.ts';
import { Chord } from '../types.ts';

describe('chord-tests', () => {

  it('chords', () => {
    expect(chord('Cmaj')).toEqual([60,64,67]);
    expect(chord('Dmaj')).toEqual([62,66,69]);
    expect(chord('Cmin')).toEqual([60,63,67]);
    expect(chord('Caug')).toEqual([60,64,68]);
    expect(chord('EaugMaj7')).toEqual([64,68,72,75]);
  })

  it('supportive', () => {
    expect(midiToPitchClass(60)).toEqual({pc: 0, octave: 0, text: "0", add: 0});
    expect(midiToPitchClass(50,50)).toEqual({pc: 0, octave: 0, text: "0", add: 0});
    expect(midiToPitchClass(58,70)).toEqual({pc: 0, octave: -1, text: "_0", add: 0});
    expect(midiToPitchClass(59)).toEqual({pc: 6, octave: -1, text: "_6", add: 0});
  })

  it('romans', () => {
    expect(pattern('i ii iii iv v vi vii').notes()).toEqual([[60, 64, 67], [62, 65, 69], [64, 67, 71], [65, 69, 72], [67, 71, 74], [69, 72, 76], [71, 74, 77]]);
    expect(pattern('i ii iii iv v vi vii',{key: "D3"}).notes()).toEqual([[50, 54, 57], [52, 55, 59], [54, 57, 61], [55, 59, 62], [57, 61, 64], [59, 62, 66], [61, 64, 67]]);
    expect(pattern('i', {key: "D3"}).pitches()).toEqual([[0,2,4]]);
    expect(pattern('ii 0').update().notes()).toEqual([[62,65,69], 60]);
    expect(pattern('imin').update().notes()).toEqual([[60,63,67]]);
    expect(pattern('i^min').update().notes()).toEqual([[60,63,67]]);
    expect(pattern('i', {scale: "minor"}).notes()[0]).toEqual([60,63,67]);
  })

  it('chords', () => {
    expect(pattern('123 234').pitches()).toEqual([[1,2,3],[2,3,4]]);
  })

  it('namedChords', () => {
    expect(pattern('Cmaj').notes()).toEqual([[60,64,67]]);
    expect(pattern('Cmaj').pitches()).toEqual([[0,4,7]]);
    expect(pattern('Cmaj', {scale: "CHROMATIC"}).pitches()).toEqual([[0,4,7]]);
    expect(pattern('Cmaj Cmin D7 Edim').pitches()).toEqual([[0,4,7],[0,3,7],[0,4,7,10],[0,3,6]]);
    expect(pattern('Cmaj Cmin D7 Edim').notes()).toEqual([[60, 64, 67],[60, 63, 67],[62, 66, 69, 72],[64, 67, 70]]);
    expect(pattern('Cmaj Cmin').notes()).toEqual([[60,64,67],[60,63,67]]);
  })

  it('notes', () => {
    expect(pattern('C D E F G A B').notes()).toEqual([ 60, 62, 64, 65, 67, 69, 71 ]);
    expect(pattern('(C B)+(D F)').notes()).toEqual([ 62, 72, 65, 76 ]);
    expect(pattern('C e F F q E e F').durations()).toEqual([ 0.25, 0.125, 0.125, 0.25, 0.125 ]);
  })

  it('inversions', () => {
    expect(pattern('i i%1').notes()).toEqual([[60,64,67],[72,64,67]]);
    expect(pattern('024 024%1').notes()).toEqual([[60,64,67],[72,64,67]]);
    expect(pattern('Cmaj Cmaj%1').notes()).toEqual([[60,64,67],[72,64,67]]);

    expect(pattern('i i%-1').notes()).toEqual([[60,64,67],[55,64,60]]);
    expect(pattern('024 024%-1').notes()).toEqual([[60,64,67],[55,64,60]]);
    expect(pattern('Cmaj Cmaj%-1').notes()).toEqual([[60,64,67],[55,64,60]]);
    expect(pattern("i v").notes()).toEqual([ [ 60, 64, 67 ], [ 67, 71, 74 ] ]);
    expect(pattern("i v%-1").notes()).toEqual([ [ 60, 64, 67 ], [ 62, 71, 67 ] ]);
  })

  it('voiceLeading', () => {
    expect(voiceLead([60,64,67],[67,71,74])).toEqual([62,67,71]);
    expect(tMatrix([60,64,67],[67,71,74])).toEqual([2,3,4]);
    expect(pattern('i v vi').notes()).toEqual([[60,64,67],[67,71,74],[69,72,76]]);
    expect(pattern('i v vi').lead().notes()).toEqual([[60,64,67],[62,67,71],[60,64,69]]);
    expect(pattern('i v7 vi').lead().notes()).toEqual([[60,64,67],[62,65,67,77],[60,64,67]]);
  })

  it('inverting', () => {
    const a = pattern('i i').invert(-1);
    const b = (a.next() as Chord).notes();
    const c = (a.next() as Chord).notes();
    expect(b).toEqual([55,64,60]);
    expect(c).toEqual([55,64,60]);
  })

  it('chordswithsounds', () => {
    expect(pattern('0:{0}2:{1}5:{2}').indices()).toEqual([0,1,2]);
  })

  it('chordToPcSet', () => {
    expect(chordToPcSet([60,64,67])).toEqual([0,4,7]);
    expect(chordToPcSet([60,64,67]).toString()).toEqual("0,4,7");
    expect(chordToPcSet([60,64,67,72]).toString()).toEqual("0,4,7");
    const c = pattern('i7-5').notes()[0] as number[];
    expect(chordToPcSet(c)).toEqual([0,4,6,10]);
  })

  it('arpeggios', () => {
    expect(pattern("024").notes()).toEqual([[60,64,67]]);
    expect(pattern("024@(0 2 1)").notes()).toEqual([60,67,64]);
    expect(pattern("024@(0 2 21)").notes()).toEqual([60,67,[67,64]]);
    expect(pattern("024@(0 2 1 3)").notes()).toEqual([60,67,64,60]);
    expect(pattern("i@(0 2 1 3)").notes()).toEqual([60,67,64,60]);
    expect(pattern("i7@(0 2 21 31)").notes()).toEqual([60,67,[67,64],[70,64]]);
    expect(pattern("i7").notes()).toEqual([[60,64,67,70]]);
    expect(pattern("i7@(0 2 1 3)").notes()).toEqual([60,67,64,70]);
    expect(pattern("C7@(0 2 1 3)").notes()).toEqual([60,67,64,70]);
    expect(pattern("Cmaj@(0 2 1 3)").notes()).toEqual([60,67,64,60]);
    expect(pattern("Dmaj@(0 2 1 3)").notes()).toEqual([62,69,66,62]);
  
    expect(pattern("024").arpeggio("0 2 1").notes()).toEqual([60,67,64]);
    expect(pattern("0246").arpeggio("0 2 1 3").notes()).toEqual([60,67,64,71]);
    expect(pattern("0246").arpeggio([0,2,1,3]).notes()).toEqual([60,67,64,71]);
    expect(pattern("i7").arpeggio([0,2,1,3]).notes()).toEqual([60,67,64,70]);

    const pat = pattern("0246").arpeggio("2 ^2 2");
    expect(pat.notes()).toEqual([ 67, 79, 67 ]);

    const pat2 = pattern("0246").arpeggio("2 ^ 2 2");
    expect(pat2.notes()).toEqual([67, 79, 79]);

    expect(pattern("10",{"scale": "minor"}).arpeggio([1]).collect("scaleName")).toEqual(["minor"]);
  })


})