refactor: split main runtime handlers into focused modules

src/main/runtime/mpv-osd-log-main-deps.test.ts

@@ -0,0 +1,46 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import {
+  createBuildAppendToMpvLogMainDepsHandler,
+  createBuildShowMpvOsdMainDepsHandler,
+} from './mpv-osd-log-main-deps';
+
+test('append to mpv log main deps map filesystem functions and log path', () => {
+  const calls: string[] = [];
+  const deps = createBuildAppendToMpvLogMainDepsHandler({
+    logPath: '/tmp/mpv.log',
+    dirname: (targetPath) => {
+      calls.push(`dirname:${targetPath}`);
+      return '/tmp';
+    },
+    mkdirSync: (targetPath) => calls.push(`mkdir:${targetPath}`),
+    appendFileSync: (_targetPath, data) => calls.push(`append:${data}`),
+    now: () => new Date('2026-02-20T00:00:00.000Z'),
+  })();
+
+  assert.equal(deps.logPath, '/tmp/mpv.log');
+  assert.equal(deps.dirname('/tmp/mpv.log'), '/tmp');
+  deps.mkdirSync('/tmp', { recursive: true });
+  deps.appendFileSync('/tmp/mpv.log', 'line', { encoding: 'utf8' });
+  assert.equal(deps.now().toISOString(), '2026-02-20T00:00:00.000Z');
+  assert.deepEqual(calls, ['dirname:/tmp/mpv.log', 'mkdir:/tmp', 'append:line']);
+});
+
+test('show mpv osd main deps map runtime delegates and logging callback', () => {
+  const calls: string[] = [];
+  const client = { id: 'mpv' };
+  const deps = createBuildShowMpvOsdMainDepsHandler({
+    appendToMpvLog: (message) => calls.push(`append:${message}`),
+    showMpvOsdRuntime: (_mpvClient, text, fallbackLog) => {
+      calls.push(`show:${text}`);
+      fallbackLog('fallback');
+    },
+    getMpvClient: () => client,
+    logInfo: (line) => calls.push(`info:${line}`),
+  })();
+
+  assert.deepEqual(deps.getMpvClient(), client);
+  deps.appendToMpvLog('hello');
+  deps.showMpvOsdRuntime(deps.getMpvClient(), 'subtitle', (line) => deps.logInfo(line));
+  assert.deepEqual(calls, ['append:hello', 'show:subtitle', 'info:fallback']);
+});