test: stream less reasoning so the size test stays fast on CI (#418)

Author: robelest

src/vercel/client/reasoningSize.test.ts

@@ -9,9 +9,9 @@ import type { ComponentApi } from "../../component/_generated/component.js";
 // https://github.com/convex/agent/issues/418
 // The component runs as the root app here so the test can read stored rows.
 const component = api as unknown as ComponentApi;
-const MiB = 1 << 20;
-// Spaces every 10KB keep the mock's per-word stream chunks few and large.
-const LONG = Array.from({ length: 40 }, () => "r".repeat(10_000)).join(" ");
+// Large enough that storing it three times stands out, small enough to stream
+// quickly. Spaces every 10KB keep the mock's per-word chunks few and large.
+const LONG = Array.from({ length: 4 }, () => "r".repeat(10_000)).join(" ");
 const SIGNED = { mock: { signature: "sig-123" } };
 const ENCRYPTED = {
   openai: { itemId: "rs_1", reasoningEncryptedContent: "opaque-blob" },
@@ -57,9 +57,7 @@ async function expectStoredOnce(t: T) {
     await t.run((ctx) => ctx.db.query("messages").collect())
   ).filter((doc) => doc.message?.role === "assistant");
   expect(docs).toHaveLength(1);
-  expect(getDocumentSize(docs[0])).toBeLessThan(
-    Math.min(MiB, LONG.length * 1.5),
-  );
+  expect(getDocumentSize(docs[0])).toBeLessThan(LONG.length * 1.5);
   return docs[0];
 }
 
@@ -77,7 +75,7 @@ async function readAssistant(t: T, threadId: string) {
 
 describe("step reasoning is stored once and derived on read", () => {
   test.each<Generation>(["generateText", "streamText"])(
-    "long reasoning saves under the document limit (%s)",
+    "long reasoning is stored once (%s)",
     async (how) => {
       const t = initConvexTest();
       const agent = agentWith([