chore: import upstream snapshot with attribution

tests/unit/rerank.test.ts

@@ -0,0 +1,52 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const { transformResponseFromProvider } = await import("../../open-sse/handlers/rerank.ts");
+
+test("transformResponseFromProvider coerces numeric data.id to string for nvidia format", () => {
+  const result = transformResponseFromProvider(
+    { format: "nvidia" },
+    { id: 12345, rankings: [] }
+  );
+
+  assert.equal(typeof result.id, "string");
+  assert.equal(result.id, "12345");
+});
+
+test("transformResponseFromProvider coerces numeric zero data.id to string", () => {
+  const result = transformResponseFromProvider(
+    { format: "nvidia" },
+    { id: 0, rankings: [] }
+  );
+
+  assert.equal(typeof result.id, "string");
+  assert.equal(result.id, "0");
+});
+
+test("transformResponseFromProvider uses fallback when data.id is null", () => {
+  const result = transformResponseFromProvider(
+    { format: "nvidia" },
+    { id: null, rankings: [] }
+  );
+
+  assert.ok(result.id.startsWith("rerank-"));
+});
+
+test("transformResponseFromProvider uses fallback when data.id is undefined", () => {
+  const result = transformResponseFromProvider(
+    { format: "nvidia" },
+    { rankings: [] }
+  );
+
+  assert.ok(result.id.startsWith("rerank-"));
+});
+
+test("transformResponseFromProvider passes through string id unchanged", () => {
+  const result = transformResponseFromProvider(
+    { format: "nvidia" },
+    { id: "nvidia-abc", rankings: [] }
+  );
+
+  assert.equal(typeof result.id, "string");
+  assert.equal(result.id, "nvidia-abc");
+});