test.ts

import VoicingDictionary from "@tonaljs/voicing-dictionary";
import { topNoteDiff } from "@tonaljs/voice-leading";
import Voicing from "./index";

const { lefthand, triads } = VoicingDictionary;

describe("search", () => {
  test("C major triad inversions", () => {
    expect(Voicing.search("C", ["C3", "C5"], triads)).toEqual([
      ["C3", "E3", "G3"],
      ["C4", "E4", "G4"],
      ["E3", "G3", "C4"],
      ["E4", "G4", "C5"],
      ["G3", "C4", "E4"],
    ]);
  });
  // here, we override range and dictionary
  test("C^7 lefthand", () => {
    expect(Voicing.search("C^7", ["E3", "D5"], lefthand)).toEqual([
      ["E3", "G3", "B3", "D4"],
      ["E4", "G4", "B4", "D5"],
      ["B3", "D4", "E4", "G4"],
    ]);
  });
  // this shows that even symbols that are not part of chord-type could be used, as long as they are present in the dictionary
  test("Cminor7 lefthand", () => {
    expect(
      Voicing.search("Cminor7", ["Eb3", "D5"], {
        minor7: ["3m 5P 7m 9M", "7m 9M 10m 12P"],
      }),
    ).toEqual([
      ["Eb3", "G3", "Bb3", "D4"],
      ["Eb4", "G4", "Bb4", "D5"],
      ["Bb3", "D4", "Eb4", "G4"],
    ]);
  });
});

describe("get", () => {
  test("get", () => {
    // all default => pretty useless but
    expect(Voicing.get("Dm7")).toEqual(["F3", "A3", "C4", "E4"]);
    // without lastVoicing
    expect(Voicing.get("Dm7", ["F3", "A4"], lefthand, topNoteDiff)).toEqual([
      "F3",
      "A3",
      "C4",
      "E4",
    ]);
    // with lastVoicing
    expect(
      Voicing.get("Dm7", ["F3", "A4"], lefthand, topNoteDiff, [
        "C4",
        "E4",
        "G4",
        "B4",
      ]),
    ).toEqual(["C4", "E4", "F4", "A4"]);
  });
});

test("sequence", () => {
  expect(
    Voicing.sequence(["C", "F", "G"], ["F3", "A4"], triads, topNoteDiff),
  ).toEqual([
    ["C4", "E4", "G4"], // root position
    ["A3", "C4", "F4"], // first inversion (F4 closest to G4)
    ["B3", "D4", "G4"], // first inversion (G4 closest to F4)
  ]);
});