Record reading cost for item 51's chunk

src/http/route-table.test.ts

@@ -0,0 +1,29 @@
+// Internal route-table matching: exact path, a GET route also answering HEAD (like the plugin
+// router), method-distinct entries on the same path.
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { type BuiltinRoute, matchBuiltinRoute } from "./builtin-routes.ts";
+
+const entry = (method: "GET" | "POST", path: string): BuiltinRoute => ({ handler: () => null, method, path });
+
+test("matches exact path + method; GET also answers HEAD", () => {
+  const get = entry("GET", "/error");
+  const post = entry("POST", "/logout");
+  const routes = [get, post];
+  assert.equal(matchBuiltinRoute(routes, "GET", "/error"), get);
+  assert.equal(matchBuiltinRoute(routes, "HEAD", "/error"), get);
+  assert.equal(matchBuiltinRoute(routes, "POST", "/logout"), post);
+  assert.equal(matchBuiltinRoute(routes, "GET", "/logout"), undefined, "a POST route does not answer GET");
+  assert.equal(matchBuiltinRoute(routes, "HEAD", "/logout"), undefined, "a POST route does not answer HEAD");
+  assert.equal(matchBuiltinRoute(routes, "POST", "/error"), undefined, "a GET route does not answer POST");
+  assert.equal(matchBuiltinRoute(routes, "GET", "/nope"), undefined);
+  assert.equal(matchBuiltinRoute(routes, "GET", "/error/sub"), undefined, "exact path, no prefix matching");
+});
+
+test("the same path may carry method-distinct entries (consent screen GET + decision POST)", () => {
+  const screen = entry("GET", "/oauth2/consent");
+  const decision = entry("POST", "/oauth2/consent");
+  const routes = [screen, decision];
+  assert.equal(matchBuiltinRoute(routes, "GET", "/oauth2/consent"), screen);
+  assert.equal(matchBuiltinRoute(routes, "POST", "/oauth2/consent"), decision);
+});