feat: add chrome path picker

tests/test_gui.py

@@ -733,9 +733,61 @@ class GuiTests(TempDirMixin, unittest.TestCase):
                 self.assertFalse(hidden_widget.isEnabled())
                 self.assertEqual(-1, tab.infrastructure_form_layout.indexOf(hidden_widget))
             self.assertGreaterEqual(
-                tab.infrastructure_form_layout.indexOf(tab.chrome_path_edit),
+                tab.infrastructure_form_layout.indexOf(tab.chrome_path_widget),
                 0,
             )
+            self.assertEqual("选择...", tab.chrome_path_browse_button.text())
+            self.assertEqual("chromePathBrowseButton", tab.chrome_path_browse_button.objectName())
+            self.assertIs(
+                tab.chrome_path_widget.layout().itemAt(0).widget(),
+                tab.chrome_path_edit,
+            )
+            self.assertIs(
+                tab.chrome_path_widget.layout().itemAt(1).widget(),
+                tab.chrome_path_browse_button,
+            )
+
+        self.assert_removed(temp_dir)
+
+    def test_settings_tab_browses_chrome_path(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self.make_config(temp_dir)
+            statuses = []
+            tab = SettingsTab(config=cfg, status_callback=statuses.append)
+            self.addCleanup(tab.close)
+            selected_path = os.path.join(temp_dir, "Chrome", "chrome.exe")
+            os.makedirs(os.path.dirname(selected_path), exist_ok=True)
+
+            self.assertFalse(tab.is_dirty())
+            with mock.patch(
+                "app.gui.tabs.settings.QFileDialog.getOpenFileName",
+                return_value=(selected_path, "Chrome 程序 (chrome.exe)"),
+            ) as browse:
+                tab.chrome_path_browse_button.click()
+
+            browse.assert_called_once()
+            self.assertEqual("选择 Chrome 程序", browse.call_args[0][1])
+            self.assertEqual(selected_path, tab.chrome_path_edit.text())
+            self.assertTrue(tab.is_dirty())
+            self.assertFalse(tab.unsaved_changes_label.isHidden())
+
+            with mock.patch("app.gui.QMessageBox.information") as info:
+                self.assertTrue(tab.save_app_settings())
+            info.assert_called_once_with(tab, "保存设置", "设置已保存")
+            saved = appconfig.load_config(cfg["config_path"])
+            self.assertEqual(selected_path, saved["chrome_path"])
+            self.assertFalse(tab.is_dirty())
+
+            tab._set_dirty(False)
+            previous_path = tab.chrome_path_edit.text()
+            with mock.patch(
+                "app.gui.tabs.settings.QFileDialog.getOpenFileName",
+                return_value=("", ""),
+            ):
+                tab.chrome_path_browse_button.click()
+
+            self.assertEqual(previous_path, tab.chrome_path_edit.text())
+            self.assertFalse(tab.is_dirty())
 
         self.assert_removed(temp_dir)