WIP

src/audio/garden-audio-energy.test.ts

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+import { describe, expect, it } from 'vitest';
+
+import { GardenAudioEnergy } from './garden-audio-energy';
+
+describe('GardenAudioEnergy', () => {
+  it('suspends activity but keeps a fading level when the gesture ends', () => {
+    const energy = new GardenAudioEnergy();
+
+    energy.beginGesture(0);
+    energy.recordStroke(0.8, 0.1);
+    energy.update(0.1);
+    energy.update(0.2);
+
+    const levelBeforeLift = energy.getLevel();
+    expect(energy.getActivity()).toBeGreaterThan(0);
+
+    energy.endGesture();
+
+    expect(energy.getActivity()).toBe(0);
+    expect(energy.getLevel()).toBe(levelBeforeLift);
+    energy.update(0.3);
+    expect(energy.getLevel()).toBeLessThan(levelBeforeLift);
+    expect(energy.getLevel()).toBeGreaterThan(0);
+  });
+
+  it('uses recent stroke intensity rather than gesture duration alone', () => {
+    const energy = new GardenAudioEnergy();
+
+    energy.beginGesture(0);
+    energy.recordStroke(1, 0.1);
+    energy.update(0.1);
+    energy.update(0.2);
+    const activeLevel = energy.getActivity();
+
+    energy.update(1.2);
+
+    expect(energy.getActivity()).toBeLessThan(activeLevel);
+  });
+
+  it('raises activity immediately when a stroke is recorded', () => {
+    const energy = new GardenAudioEnergy();
+
+    energy.beginGesture(0);
+    energy.recordStroke(0.12, 0.05);
+
+    expect(energy.getActivity()).toBeGreaterThan(0.09);
+  });
+});