From 4d9f77f7bf41e13d2c2c55a6adbeb14dbcd5750a Mon Sep 17 00:00:00 2001
From: Greg Shikhman <shikhman@google.com>
Date: Tue, 21 Oct 2025 00:47:58 +0000
Subject: [PATCH] test: add readWasmBinaryFromDisk unit test

---
 .../core/src/utils/__fixtures__/dummy.wasm    |  1 +
 packages/core/src/utils/fileUtils.test.ts     | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 packages/core/src/utils/__fixtures__/dummy.wasm

diff --git a/packages/core/src/utils/__fixtures__/dummy.wasm b/packages/core/src/utils/__fixtures__/dummy.wasm
new file mode 100644
index 00000000000..e05f8614d9a
--- /dev/null
+++ b/packages/core/src/utils/__fixtures__/dummy.wasm
@@ -0,0 +1 @@
+This is a wasm fixture.
diff --git a/packages/core/src/utils/fileUtils.test.ts b/packages/core/src/utils/fileUtils.test.ts
index 2fd4174ab0d..49117528f51 100644
--- a/packages/core/src/utils/fileUtils.test.ts
+++ b/packages/core/src/utils/fileUtils.test.ts
@@ -19,6 +19,7 @@ import fs from 'node:fs';
 import fsPromises from 'node:fs/promises';
 import path from 'node:path';
 import os from 'node:os';
+import { fileURLToPath } from 'node:url';
 // eslint-disable-next-line import/no-internal-modules
 import mime from 'mime/lite';
 
@@ -30,6 +31,7 @@ import {
   detectBOM,
   readFileWithEncoding,
   fileExists,
+  readWasmBinaryFromDisk,
 } from './fileUtils.js';
 import { StandardFileSystemService } from '../services/fileSystemService.js';
 
@@ -77,6 +79,23 @@ describe('fileUtils', () => {
     vi.restoreAllMocks(); // Restore any spies
   });
 
+  describe('readWasmBinaryFromDisk', () => {
+    it('loads a WASM binary from disk as a Uint8Array', async () => {
+      const wasmFixtureUrl = new URL(
+        './__fixtures__/dummy.wasm',
+        import.meta.url,
+      );
+      const wasmFixturePath = fileURLToPath(wasmFixtureUrl);
+      const result = await readWasmBinaryFromDisk(wasmFixturePath);
+      const expectedBytes = new Uint8Array(
+        await fsPromises.readFile(wasmFixturePath),
+      );
+
+      expect(result).toBeInstanceOf(Uint8Array);
+      expect(result).toStrictEqual(expectedBytes);
+    });
+  });
+
   describe('isWithinRoot', () => {
     const root = path.resolve('/project/root');