rework of the e2e test suites

tests/ui/purchase/coupon-setup.test.ts

@@ -0,0 +1,12 @@
+import { test, expectFixture as expect } from '../helpers/test-fixtures';
+
+test.describe('Coupon scaffolding', () => {
+  test('default coupon presets are created via testing API', async ({ seedTestCoupons }) => {
+    const seeded = await seedTestCoupons();
+
+    expect(seeded.length).toBeGreaterThanOrEqual(3);
+    expect(seeded.map((coupon) => coupon.code)).toEqual(
+      expect.arrayContaining(['PERCENT10', 'FLAT50', 'EXPIRED25'])
+    );
+  });
+});