Sonora: local 3D audio visualizer (initial import)

Three.js + Web Audio FFT visualizer with Constellation, Texture, Frequency
and Modulation views. Vite build, node --test suite.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JABXBRLs9T6nqHKUVwoTHJ

tests/color.test.js

@@ -0,0 +1,28 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { colorStyle } from '../src/color.js';
+
+test('each spatial axis changes the color at equal loudness', () => {
+  const base = colorStyle(0, 3.5, 0, 0.5, 'spectrum', 'position');
+  for (const position of [[3, 3.5, 0], [0, 6, 0], [0, 3.5, 4]]) {
+    const next = colorStyle(...position, 0.5, 'spectrum', 'position');
+    assert.notEqual(next.h, base.h);
+  }
+});
+test('loudness changes brightness without moving spatial hue', () => {
+  const quiet = colorStyle(0, 3.5, 0, 0.1, 'spectrum', 'position');
+  const loud = colorStyle(0, 3.5, 0, 0.9, 'spectrum', 'position');
+  assert.equal(quiet.h, loud.h);
+  assert.ok(loud.energy > quiet.energy);
+});
+test('loudness mapping is independent of spatial position', () => {
+  assert.deepEqual(colorStyle(-6, 0, -6, 0.4, 'ember', 'amplitude'), colorStyle(6, 7, 6, 0.4, 'ember', 'amplitude'));
+});
+test('all palette values remain finite and bounded at plot extremes', () => {
+  for (const palette of ['ember', 'spectrum', 'glacier', 'orchid']) {
+    for (const x of [-6, 0, 6]) for (const y of [0, 7]) for (const z of [-6, 6]) {
+      const c = colorStyle(x, y, z, 1, palette, 'position');
+      for (const key of ['h', 's', 'l']) assert.ok(c[key] >= 0 && c[key] <= 1);
+    }
+  }
+});