feat: add afterglow and synchronized drive lift

tests/helpers/fake-audio-context.ts

@@ -27,6 +27,9 @@ export interface FakeAudioHarness {
   readonly gainNodes: readonly GainNode[];
   readonly buffers: AudioBuffer[];
   readonly destination: AudioNode;
+  readonly resumeCount: number;
+  readonly suspendCount: number;
+  readonly closeCount: number;
   setCurrentTime(seconds: number): void;
   decodedBuffer(durationSeconds: number, channels?: number): AudioBuffer;
   emitContextState(state: AudioContextState | 'interrupted'): void;
@@ -105,6 +108,9 @@ export function createFakeAudioHarness(): FakeAudioHarness {
   const sampleRate = 48_000;
   let currentTime = 0;
   let state: AudioContextState | 'interrupted' = 'suspended';
+  let resumeCount = 0;
+  let suspendCount = 0;
+  let closeCount = 0;
 
   const decodedBuffer = (durationSeconds: number, channels = 2): AudioBuffer => {
     const length = Math.max(1, Math.round(durationSeconds * sampleRate));
@@ -232,12 +238,15 @@ export function createFakeAudioHarness(): FakeAudioHarness {
       return decodedBuffer(1);
     },
     async resume() {
+      resumeCount += 1;
       state = 'running';
     },
     async suspend() {
+      suspendCount += 1;
       state = 'suspended';
     },
     async close() {
+      closeCount += 1;
       state = 'closed';
     },
     addEventListener(type: string, listener: () => void) {
@@ -255,6 +264,15 @@ export function createFakeAudioHarness(): FakeAudioHarness {
     gainNodes,
     buffers,
     destination,
+    get resumeCount() {
+      return resumeCount;
+    },
+    get suspendCount() {
+      return suspendCount;
+    },
+    get closeCount() {
+      return closeCount;
+    },
     setCurrentTime(seconds) {
       currentTime = seconds;
     },