fix: update router tests from main to use new single-item API

Tests added on main used the old array-based router API (handlers: [],
router.add(..., [A])). Updated to match the new single-item API
(item:, router.add(..., A)) introduced by this PR.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju

packages/fresh/src/router_test.ts

@@ -73,12 +73,12 @@ Deno.test("UrlPatternRouter - wrong + correct method", () => {
 Deno.test("UrlPatternRouter - trailing slash matches route without slash", () => {
   const router = new UrlPatternRouter();
   const A = () => {};
-  router.add("GET", "/wissen", [A]);
+  router.add("GET", "/wissen", A);
 
   const res = router.match("GET", new URL("/wissen/", "http://localhost"));
   expect(res).toEqual({
     params: Object.create(null),
-    handlers: [A],
+    item: A,
     methodMatch: true,
     pattern: "/wissen",
   });
@@ -87,12 +87,12 @@ Deno.test("UrlPatternRouter - trailing slash matches route without slash", () =>
 Deno.test("UrlPatternRouter - no trailing slash matches route with slash", () => {
   const router = new UrlPatternRouter();
   const A = () => {};
-  router.add("GET", "/wissen/", [A]);
+  router.add("GET", "/wissen/", A);
 
   const res = router.match("GET", new URL("/wissen", "http://localhost"));
   expect(res).toEqual({
     params: Object.create(null),
-    handlers: [A],
+    item: A,
     methodMatch: true,
     pattern: "/wissen/",
   });
@@ -102,16 +102,16 @@ Deno.test("UrlPatternRouter - exact match takes priority over trailing slash fal
   const router = new UrlPatternRouter();
   const A = () => {};
   const B = () => {};
-  router.add("GET", "/wissen", [A]);
-  router.add("GET", "/wissen/", [B]);
+  router.add("GET", "/wissen", A);
+  router.add("GET", "/wissen/", B);
 
   const withSlash = router.match(
     "GET",
     new URL("/wissen/", "http://localhost"),
   );
   expect(withSlash).toEqual({
     params: Object.create(null),
-    handlers: [B],
+    item: B,
     methodMatch: true,
     pattern: "/wissen/",
   });
@@ -122,7 +122,7 @@ Deno.test("UrlPatternRouter - exact match takes priority over trailing slash fal
   );
   expect(withoutSlash).toEqual({
     params: Object.create(null),
-    handlers: [A],
+    item: A,
     methodMatch: true,
     pattern: "/wissen",
   });
@@ -131,12 +131,12 @@ Deno.test("UrlPatternRouter - exact match takes priority over trailing slash fal
 Deno.test("UrlPatternRouter - root trailing slash does not double-match", () => {
   const router = new UrlPatternRouter();
   const A = () => {};
-  router.add("GET", "/", [A]);
+  router.add("GET", "/", A);
 
   const res = router.match("GET", new URL("/", "http://localhost"));
   expect(res).toEqual({
     params: Object.create(null),
-    handlers: [A],
+    item: A,
     methodMatch: true,
     pattern: "/",
   });