Playwright re-established. 54 test cases generated.

tests/user-profile-language-preference-change.spec.ts

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+// spec: specs/gymflow-test-plan.md
+// seed: tests/user-system-management.spec.ts
+
+import { test, expect } from '@playwright/test';
+
+test.describe('V. User & System Management', () => {
+  test('A. User Profile - Language Preference Change', async ({ page }) => {
+    // 1. Log in as a regular user.
+    await page.goto('http://192.168.50.234:3000/');
+    await page.getByRole('textbox', { name: 'user@gymflow.ai' }).fill('admin@gymflow.ai');
+    await page.locator('input[type="password"]').fill('admin1234');
+    await page.getByRole('button', { name: 'Login' }).click();
+
+    // 2. Navigate to the 'Profile' section.
+    await page.getByRole('button', { name: 'Profile' }).click();
+
+    // 3. Select a different language (e.g., 'Русский') from the language dropdown.
+    await page.getByRole('combobox').nth(1).selectOption(['Русский']);
+
+    // Expected Results:
+    //   - The UI language immediately switches to the selected language.
+    await expect(page.getByRole('heading', { name: 'Профиль' })).toBeVisible();
+
+    // 4. Click 'Save Profile'.
+    await page.getByRole('button', { name: 'Сохранить профиль' }).click();
+
+    // Expected Results:
+    //   - The preference persists across sessions.
+    // Log out and log back in to verify persistence.
+    await page.getByRole('button', { name: 'Выйти' }).click();
+    await page.getByRole('textbox', { name: 'user@gymflow.ai' }).fill('admin@gymflow.ai');
+    await page.locator('input[type="password"]').fill('admin1234');
+    await page.getByRole('button', { name: 'Войти' }).click();
+    await page.getByRole('button', { name: 'Профиль' }).click();
+    await expect(page.getByRole('heading', { name: 'Профиль' })).toBeVisible();
+    await expect(page.getByRole('combobox').nth(1)).toHaveValue('Русский');
+
+    // Change language back to English for subsequent tests.
+    await page.getByRole('combobox').nth(1).selectOption(['English']);
+    await page.getByRole('button', { name: 'Save Profile' }).click();
+    await expect(page.getByText('Profile saved successfully')).toBeVisible();
+  });
+});