From 4d8f3f5c62bd1c4edba4b1e59ce10d5d0b314aaa Mon Sep 17 00:00:00 2001
From: can1357 <me@can.ac>
Date: Sun, 5 Jul 2026 13:19:41 +0200
Subject: [PATCH] test(coding-agent): cover docs.rs gunzip cap

---
 .../web-scrapers/docs-rs-gunzip-cap.test.ts   | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 packages/coding-agent/test/web-scrapers/docs-rs-gunzip-cap.test.ts

diff --git a/packages/coding-agent/test/web-scrapers/docs-rs-gunzip-cap.test.ts b/packages/coding-agent/test/web-scrapers/docs-rs-gunzip-cap.test.ts
new file mode 100644
index 000000000..6eb3c476f
--- /dev/null
+++ b/packages/coding-agent/test/web-scrapers/docs-rs-gunzip-cap.test.ts
@@ -0,0 +1,51 @@
+import { afterEach, expect, mock, test } from "bun:test";
+import * as zlib from "node:zlib";
+
+const MAX_RUSTDOC_GUNZIP_BYTES = 256 * 1024 * 1024;
+const originalFetch = globalThis.fetch;
+const gzipCalls: Array<number | undefined> = [];
+
+const rustdocJson = JSON.stringify({
+	root: 0,
+	crate_version: "1.0.0",
+	index: {
+		"0": {
+			name: "capprobe",
+			docs: "root module docs",
+			attrs: [],
+			inner: { module: { items: [] } },
+			visibility: "public",
+			deprecation: null,
+		},
+	},
+	paths: {},
+	format_version: 30,
+});
+
+mock.module("node:zlib", () => ({
+	...zlib,
+	gunzipSync(_compressed: Uint8Array, options?: zlib.ZlibOptions): Buffer {
+		gzipCalls.push(options?.maxOutputLength);
+		if (options?.maxOutputLength !== MAX_RUSTDOC_GUNZIP_BYTES) {
+			throw new Error(`docs.rs rustdoc gunzip cap missing: ${options?.maxOutputLength ?? "none"}`);
+		}
+		return Buffer.from(rustdocJson);
+	},
+}));
+
+afterEach(() => {
+	globalThis.fetch = originalFetch;
+	gzipCalls.length = 0;
+});
+
+test("caps decompressed docs.rs rustdoc JSON", async () => {
+	globalThis.fetch = async () => new Response(new Uint8Array([1, 2, 3]), { status: 200 });
+	const crateName = `capprobe_${process.pid}_${Date.now()}`;
+
+	// Dynamic import is intentional: the zlib module mock must be installed before docs-rs captures its named import.
+	const { handleDocsRs } = await import("../../src/web/scrapers/docs-rs");
+	const result = await handleDocsRs(`https://docs.rs/${crateName}/1.0.0/${crateName}/index.html`, 10);
+
+	expect(gzipCalls).toEqual([MAX_RUSTDOC_GUNZIP_BYTES]);
+	expect(result?.content).toContain("root module docs");
+});