Add Test for Afterpay alert

src/layouts/payment-page/payment-page.spec.js

@@ -468,4 +468,21 @@ describe('payment-page.vue', () => {
             expect(creditCardErrorAlert.isVisible()).toBeTruthy();
         });
     });
+
+    describe('AfterPay Error Alert', () => {
+        test('show after pay error alert', () => {
+            // Arrange
+            const queryString = {
+                [queryStrings.DISPLAY_PAY_IN_ADVANCE_ALERT]: paymentMethods.AFTERPAY
+            };
+            const wrapper = setupMocks({ queryString });
+
+            // Act
+
+            // Assert
+            const afterPayErrorAlert = wrapper.find('[name="payInAdvanceAfterPayErrorAlert"]');
+            expect(afterPayErrorAlert.exists()).toBeTruthy();
+            expect(afterPayErrorAlert.isVisible()).toBeTruthy();
+        });
+    });
 });