feat(core): add Electron runtime, services, and app composition

src/window-trackers/x11-tracker.test.ts

@@ -0,0 +1,54 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { parseX11WindowGeometry, parseX11WindowPid, X11WindowTracker } from './x11-tracker';
+
+test('parseX11WindowGeometry parses xwininfo output', () => {
+  const geometry = parseX11WindowGeometry(`
+Absolute upper-left X:  120
+Absolute upper-left Y:  240
+Width: 1280
+Height: 720
+`);
+  assert.deepEqual(geometry, {
+    x: 120,
+    y: 240,
+    width: 1280,
+    height: 720,
+  });
+});
+
+test('parseX11WindowPid parses xprop output', () => {
+  assert.equal(parseX11WindowPid('_NET_WM_PID(CARDINAL) = 4242'), 4242);
+  assert.equal(parseX11WindowPid('_NET_WM_PID(CARDINAL) = not-a-number'), null);
+});
+
+test('X11WindowTracker skips overlapping polls while one command is in flight', async () => {
+  let commandCalls = 0;
+  let release: (() => void) | undefined;
+  const gate = new Promise<void>((resolve) => {
+    release = resolve;
+  });
+
+  const tracker = new X11WindowTracker(undefined, async (command) => {
+    commandCalls += 1;
+    if (command === 'xdotool') {
+      await gate;
+      return '123';
+    }
+    if (command === 'xwininfo') {
+      return `Absolute upper-left X:  0
+Absolute upper-left Y:  0
+Width: 640
+Height: 360`;
+    }
+    return '';
+  });
+
+  (tracker as unknown as { pollGeometry: () => void }).pollGeometry();
+  (tracker as unknown as { pollGeometry: () => void }).pollGeometry();
+  assert.equal(commandCalls, 1);
+
+  assert.ok(release);
+  release();
+  await new Promise((resolve) => setTimeout(resolve, 0));
+});