chore: import upstream snapshot with attribution

tests/unit/default-url-normalizers-split.test.ts

@@ -0,0 +1,36 @@
+import { test } from "node:test";
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+// Split-guard for the default executor URL-normalizer extraction.
+// The pure per-provider chat-URL normalizers live in default/urlNormalizers.ts
+// (string transforms only). Host imports them back into buildUrl/transformRequest.
+const HERE = dirname(fileURLToPath(import.meta.url));
+const EXE = join(HERE, "../../open-sse/executors");
+const HOST = join(EXE, "default.ts");
+const LEAF = join(EXE, "default/urlNormalizers.ts");
+
+test("leaf hosts the normalizers and does not import the host", () => {
+  const src = readFileSync(LEAF, "utf8");
+  for (const sym of [
+    "normalizeOpenAIChatUrl",
+    "normalizeSapChatUrl",
+    "getOpenRouterConnectionPreset",
+  ]) {
+    assert.match(src, new RegExp(`export function ${sym}\\b`));
+  }
+  assert.doesNotMatch(src, /from "\.\.\/default\.ts"/);
+});
+
+test("host imports the normalizers back from the leaf", () => {
+  const host = readFileSync(HOST, "utf8");
+  assert.match(host, /from "\.\/default\/urlNormalizers\.ts"/);
+});
+
+test("normalizeOpenAIChatUrl appends chat/completions for a bare base URL", async () => {
+  const { normalizeOpenAIChatUrl } =
+    await import("../../open-sse/executors/default/urlNormalizers.ts");
+  assert.match(normalizeOpenAIChatUrl("https://api.example.com"), /\/v1\/chat\/completions$/);
+});