test: add test for credentrial detection in protocol agnistic url

packages/fetch-mock/src/__tests__/FetchMock/routing.test.js

@@ -1,4 +1,4 @@
-import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
 import fetchMock from '../../FetchMock';
 
 describe('Routing', () => {
@@ -250,17 +250,4 @@ describe('Routing', () => {
 			expect(res.status).toEqual(200);
 		});
 	});
-
-	describe('relative routes', () => {
-		beforeEach(() => {
-			fm.config.allowRelativeUrls = true;
-		});
-		afterEach(() => {
-			fm.config.allowRelativeUrls = false;
-		});
-		it('allows handling relative routes', async () => {
-			fm.route('/relative/path', 200);
-			await fm.fetchHandler('/relative/path');
-		});
-	});
 });

packages/fetch-mock/src/__tests__/spec-compliance.test.js

@@ -23,6 +23,15 @@ describe('Spec compliance', () => {
 				),
 			);
 		});
+		it('rejects on protocol agnostic url containing credentials', async () => {
+			await expect(
+				fetchMock.fetchHandler('//user:password@a.com'),
+			).rejects.toThrow(
+				new TypeError(
+					'Request cannot be constructed from a URL that includes credentials: //user:password@a.com/',
+				),
+			);
+		});
 		it('reject if the request method is GET or HEAD and the body is non-null.', async () => {
 			await expect(
 				fetchMock.fetchHandler('http://a.com', { body: 'a' }),