Fix blocks e2e test for `additional-fields.merchant.block_theme.side_effects.spec.ts` (#46258)

* Wait for DOMContentLoaded to ensure that scripts are run when we try click edit shipping details.

plugins/woocommerce-blocks/tests/e2e/tests/checkout/additional-fields.merchant.block_theme.side_effects.spec.ts

@@ -297,11 +297,17 @@ test.describe( 'Merchant → Additional Checkout Fields', () => {
 			.getByLabel( 'Is this a personal purchase or a business purchase?' )
 			.selectOption( 'personal' );
 
-		await admin.page
+		const clickPromise = admin.page
 			.getByRole( 'button', { name: 'Update' } )
 			.first()
 			.click();
 
+		const navigationPromise = admin.page.waitForEvent( 'domcontentloaded' );
+
+		// When update is clicked without waiting for DOMContentLoaded the page becomes
+		// available before click handlers are attached to the shipping edit link.
+		await Promise.all( [ clickPromise, navigationPromise ] );
+
 		await admin.page
 			.getByRole( 'heading', { name: 'Shipping Edit' } )
 			.getByRole( 'link' )

plugins/woocommerce/changelog/46258-dev-fix-e2e-additional-fields

@@ -0,0 +1,4 @@
+Significance: patch
+Type: dev
+Comment: Fix blocks e2e test for additional-fields.merchant.block_theme.side_effects.spec.ts
+