feat: добавить управление окружениями и Playwright для E2E

e2e/environment.spec.ts

@@ -0,0 +1,73 @@
+import { test, expect } from '@playwright/test';
+
+test.describe('Environment Management', () => {
+  test('should not allow removing DEFAULT environment', async ({ page }) => {
+    await page.goto('/');
+    await page.click('button:has-text("Create new")');
+
+    // Try to remove DEFAULT - should be blocked
+    const removeButton = page.locator('button.btn-danger[title="Remove environment"]');
+    
+    // The button should be disabled for DEFAULT
+    await expect(removeButton).toBeDisabled();
+  });
+
+  test('should remove non-DEFAULT environment', async ({ page }) => {
+    await page.goto('/');
+    await page.click('button:has-text("Create new")');
+
+    // Create a new environment
+    page.once('dialog', async dialog => {
+      await dialog.accept('toRemove');
+    });
+    await page.click('button.btn-success[title="Add environment"]');
+    await page.waitForTimeout(500);
+
+    // Verify we have 2 envs
+    await expect(page.locator('#environments option')).toHaveCount(2);
+
+    // Remove the new environment
+    page.once('dialog', async dialog => {
+      await dialog.accept(); // Confirm removal
+    });
+    await page.click('button.btn-danger[title="Remove environment"]');
+    await page.waitForTimeout(300);
+
+    // Verify we're back to 1 env (DEFAULT)
+    await expect(page.locator('#environments option')).toHaveCount(1);
+    await expect(page.locator('#environments')).toContainText('DEFAULT');
+  });
+
+  test('should create new environment and switch without errors', async ({ page }) => {
+    await page.goto('/');
+    await page.click('button:has-text("Create new")');
+
+    // Verify DEFAULT environment is loaded
+    await expect(page.locator('#environments')).toContainText('DEFAULT');
+
+    // Create a new environment
+    page.once('dialog', async dialog => {
+      await dialog.accept('env1');
+    });
+    await page.click('button.btn-success[title="Add environment"]');
+    await page.waitForTimeout(500);
+
+    // Verify new environment is created
+    await expect(page.locator('#environments option')).toHaveCount(2);
+
+    // Switch back to DEFAULT (by index 0)
+    await page.locator('#environments').selectOption({ index: 0 });
+    await page.waitForTimeout(300);
+
+    // Verify the page is still working
+    await expect(page.locator('#environments')).toBeVisible();
+
+    // Switch to env1 (by text) - this should NOT cause error
+    await page.locator('#environments').selectOption('env1');
+    await page.waitForTimeout(300);
+
+    // Verify the page is still working (no white screen of death)
+    await expect(page.locator('#environments')).toBeVisible();
+    await expect(page.locator('#environments option')).toHaveCount(2);
+  });
+});