test: restore minimized Transit windows before screenshots

src/qaChrome.test.mjs

@@ -1,6 +1,10 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { MACOS_CHROME, chromeExecutablePath } from '../scripts/qa-chrome.mjs';
+import {
+  MACOS_CHROME,
+  chromeExecutablePath,
+  captureQaScreenshot,
+} from '../scripts/qa-chrome.mjs';
 
 test('gates keep macOS Chrome where it is installed', () => {
   assert.equal(
@@ -25,3 +29,54 @@ test('an explicit executable path wins', () => {
     'C:\\Chrome\\chrome.exe',
   );
 });
+
+test('screenshots restore minimized test windows before capture and detach their session', async () => {
+  const calls = [];
+  const session = {
+    send: async (method, params) => {
+      calls.push([method, params]);
+      return { windowId: 7, bounds: { windowState: 'minimized' } };
+    },
+    detach: async () => calls.push(['detach']),
+  };
+  const page = {
+    createCDPSession: async () => session,
+    bringToFront: async () => calls.push(['front']),
+    screenshot: async (options) => {
+      calls.push(['capture', options]);
+      return 'pixels';
+    },
+  };
+  assert.equal(
+    await captureQaScreenshot(page, { path: 'proof.png' }),
+    'pixels',
+  );
+  assert.deepEqual(
+    calls.map((c) => c[0]),
+    [
+      'Browser.getWindowForTarget',
+      'Browser.setWindowBounds',
+      'front',
+      'detach',
+      'capture',
+    ],
+  );
+  assert.deepEqual(calls[1][1], {
+    windowId: 7,
+    bounds: { windowState: 'normal' },
+  });
+});
+
+test('headless capture does not manipulate a native window', async () => {
+  const options = { path: 'proof.png' };
+  const page = {
+    screenshot: async (supplied) => {
+      assert.equal(supplied, options);
+      return 'pixels';
+    },
+  };
+  assert.equal(
+    await captureQaScreenshot(page, options, { headful: false }),
+    'pixels',
+  );
+});