Add packages/edo for Equal Division of the Octave scales

packages/edo/test/edo.test.mjs

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+/*
+edo.test.mjs - tests of edo.mjs
+Copyright (C) 2025 Rob McKinnon and Strudel contributors - see <https://github.com/tidalcycles/strudel/blob/main/packages/tonal/test/tonal.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+import '../edo.mjs';
+import { n } from '@strudel/core';
+import { describe, it, expect } from 'vitest';
+
+describe('edoScale', () => {
+  it('Should run tonal functions ', () => {
+    // base note A3 = 220Hz
+    let baseNote = 'A3';
+    let root = 220;
+    let freq = 220;
+    let pattern = n('0').edoScale([baseNote, 'LLsLLLs', 2, 1]);
+    let cycle = pattern.firstCycleValues[0];
+    expect(cycle.freq).toEqual(freq);
+    expect(cycle.edo).toEqual(12);
+    expect(cycle.degree).toEqual(1);
+    expect(parseFloat(cycle.root).toFixed(0)).toEqual(root.toFixed(0));
+
+    // base note A4 = 440Hz
+    baseNote = 'A4';
+    root = 440;
+    freq = 880;
+    pattern = n('7').edoScale([baseNote, 'LLsLLLs', 2, 1]);
+    cycle = pattern.firstCycleValues[0];
+    expect(cycle.freq).toEqual(freq);
+    expect(cycle.edo).toEqual(12);
+    expect(cycle.degree).toEqual(1);
+    expect(parseFloat(cycle.root).toFixed(0)).toEqual(root.toFixed(0));
+  });
+});

packages/edo/test/edoscale.test.mjs

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+/*
+edoscale.test.mjs - tests of EdoScale from edoscale.mjs
+Copyright (C) 2025 Rob McKinnon and Strudel contributors - see <https://codeberg.org/uzu/strudel/src/branch/main/packages/edo/test/edoscale.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+import '../edoscale.mjs'; // need to import this to add prototypes
+import { EdoScale } from '../edoscale.mjs';
+import { describe, it, expect } from 'vitest';
+
+describe('EdoScale', () => {
+  it('updates edivisions', () => {
+    let scale = new EdoScale(2, 1, ['L', 'L', 's', 'L', 'L', 'L', 's']);
+    expect(scale.stepSize(0)).toEqual('L');
+    expect(scale.stepValue(0)).toEqual(2);
+
+    expect(scale.stepSize(2)).toEqual('s');
+    expect(scale.stepValue(2)).toEqual(1);
+
+    expect(scale.edivisions).toEqual(12);
+  });
+});

packages/edo/test/ratios.test.mjs

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+/*
+ratios.test.mjs - tests of ratios.mjs
+Copyright (C) 2025 Rob McKinnon and Strudel contributors - see <https://codeberg.org/uzu/strudel/src/branch/main/packages/edo/test/ratios.test.mjs>
+This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+import ratiointervals from '../ratios.mjs';
+import { describe, it, expect } from 'vitest';
+
+describe('ratiointervals', () => {
+  it('updates edivisions', () => {
+    let ratio = 9 / 7;
+    expect(ratiointervals.key(ratio)).toEqual('S3');
+    expect(ratiointervals.label(ratio)).toEqual('M3');
+    expect(ratiointervals.fjs(ratio)).toEqual('M3_7');
+    expect(ratiointervals.nom(ratio)).toEqual(9);
+    expect(ratiointervals.denom(ratio)).toEqual(7);
+  });
+});