diff --git a/README.md b/README.md
index 8b88e1d..063e596 100644
--- a/README.md
+++ b/README.md
@@ -209,9 +209,14 @@ gnome-extensions enable claude-code-status@git.vakhrushev.me
 ```sh
 gjs -m tests/test-sessions.js     # чтение состояния, порядок, живость, слежение
 gjs -m tests/test-abbrev.js       # метки чипов: сжатие, коллизии, липкость
+gjs -m tests/test-prefs.js        # окно настроек строится и находит хуки
 tests/test-hook.sh                # события -> состояния, блокировка, снос файлов
 ```
 
+`prefs.js` живёт в отдельном процессе, а не в композиторе, поэтому проверка во
+вложенном шелле до него не достаёт — без этого теста он единственный файл,
+который впервые исполняется у пользователя.
+
 `lib/sessions.js` намеренно ничего не импортирует из `resource:///org/gnome/shell`,
 а `lib/abbrev.js` — вообще ничего. Именно это позволяет гонять их вне
 композитора — в `gjs`, а `abbrev` и в `node`.
diff --git a/tests/test-prefs.js b/tests/test-prefs.js
new file mode 100644
index 0000000..fdd8023
--- /dev/null
+++ b/tests/test-prefs.js
@@ -0,0 +1,87 @@
+#!/usr/bin/gjs -m
+// Builds the preferences window for real, under real Adw.
+//
+// prefs.js runs in its own process, not in the compositor, so a nested-shell
+// check cannot reach it -- without this it is the one file in the extension
+// that never executes until a user opens it and finds it broken.
+//
+// The shell's own base class and gettext are stubbed rather than loaded: they
+// resolve an extension by walking the caller's URL up to a registered UUID,
+// which needs the whole extension manager. Stubbing them keeps the test about
+// this extension's code, which is the part that can be wrong.
+//
+// Run: gjs -m tests/test-prefs.js
+
+import Gio from 'gi://Gio';
+import GLib from 'gi://GLib';
+import Adw from 'gi://Adw';
+
+Adw.init();
+
+const HERE = GLib.path_get_dirname(
+    GLib.filename_from_uri(import.meta.url)[0]);
+const EXT = GLib.path_get_dirname(HERE);
+const SHELL_PREFS = 'resource:///org/gnome/Shell/Extensions/js/extensions/prefs.js';
+
+const tmp = GLib.dir_make_tmp('ccs-prefs-XXXXXX');
+const [, source] = GLib.file_get_contents(`${EXT}/prefs.js`);
+GLib.file_set_contents(`${tmp}/stub.js`,
+    'export class ExtensionPreferences {}\nexport const gettext = s => s;\n');
+GLib.file_set_contents(`${tmp}/prefs.js`,
+    new TextDecoder().decode(source).replace(SHELL_PREFS, './stub.js'));
+
+const schemas = Gio.SettingsSchemaSource.new_from_directory(
+    `${EXT}/schemas`, Gio.SettingsSchemaSource.get_default(), false);
+
+const { default: Prefs } = await import(`file://${tmp}/prefs.js`);
+const prefs = new Prefs();
+Object.defineProperty(prefs, 'path', { value: EXT });   // a getter upstream
+prefs.getSettings = () => new Gio.Settings({
+    settings_schema: schemas.lookup(
+        'org.gnome.shell.extensions.claude-code-status', true),
+});
+
+const window = new Adw.PreferencesWindow();
+prefs.fillPreferencesWindow(window);
+
+const rows = [];
+const walk = widget => {
+    for (let c = widget.get_first_child?.(); c; c = c.get_next_sibling()) {
+        const type = c.constructor.$gtype.name;
+        if (type === 'AdwSwitchRow' || type === 'AdwActionRow')
+            rows.push({ type, title: c.title, subtitle: c.subtitle });
+        walk(c);
+    }
+};
+walk(window);
+
+let failures = 0;
+function check(name, condition, detail = '') {
+    if (!condition)
+        failures++;
+    print(`${condition ? 'ok  ' : 'FAIL'} ${name}${detail ? `  (${detail})` : ''}`);
+}
+
+for (const row of rows)
+    print(`     ${row.type.replace('Adw', '').padEnd(10)} ${row.title}`);
+
+// One switch per settings key, so a key added without a row is caught.
+const keys = schemas.lookup('org.gnome.shell.extensions.claude-code-status', true)
+    .list_keys().length;
+const switches = rows.filter(r => r.type === 'AdwSwitchRow').length;
+check('a switch for every settings key', switches === keys, `${switches} of ${keys}`);
+
+// The hook status line is the reason this page is worth opening at all: a
+// silent panel looks the same whether nothing runs or nothing is installed.
+const status = rows.find(r => r.title === 'Status');
+check('hook status reported', !!status?.subtitle, status?.subtitle);
+check('status names the events it found',
+    /SessionStart|Not installed/.test(status?.subtitle ?? ''), status?.subtitle);
+
+const dir = rows.find(r => r.title === 'State directory');
+check('state directory shown', (dir?.subtitle ?? '').endsWith('claude-code-status'),
+    dir?.subtitle);
+
+GLib.spawn_command_line_sync(`rm -rf ${tmp}`);
+print(failures ? `\n${failures} failure(s)` : '\nall passed');
+imports.system.exit(failures ? 1 : 0);