Add playlist browser overlay modal (#37)

src/main/runtime/playlist-browser-open.test.ts

@@ -0,0 +1,28 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { IPC_CHANNELS } from '../../shared/ipc/contracts';
+import { openPlaylistBrowser } from './playlist-browser-open';
+
+test('playlist browser open bootstraps overlay runtime before dispatching the modal event', () => {
+  const calls: string[] = [];
+
+  const opened = openPlaylistBrowser({
+    ensureOverlayStartupPrereqs: () => {
+      calls.push('prereqs');
+    },
+    ensureOverlayWindowsReadyForVisibilityActions: () => {
+      calls.push('windows');
+    },
+    sendToActiveOverlayWindow: (channel, payload, runtimeOptions) => {
+      calls.push(`send:${channel}`);
+      assert.equal(payload, undefined);
+      assert.deepEqual(runtimeOptions, {
+        restoreOnModalClose: 'playlist-browser',
+      });
+      return true;
+    },
+  });
+
+  assert.equal(opened, true);
+  assert.deepEqual(calls, ['prereqs', 'windows', `send:${IPC_CHANNELS.event.playlistBrowserOpen}`]);
+});