From 8449fe0988e21dadf0db96b363fda347d93fa0e2 Mon Sep 17 00:00:00 2001
From: grypez <143971198+grypez@users.noreply.github.com>
Date: Thu, 17 Oct 2024 23:29:26 -0500
Subject: [PATCH] add marshal roundtrip test to extension

---
 packages/extension/package.json        |  1 +
 packages/extension/src/marshal.test.ts | 17 +++++++++++++++++
 yarn.lock                              |  1 +
 3 files changed, 19 insertions(+)
 create mode 100644 packages/extension/src/marshal.test.ts

diff --git a/packages/extension/package.json b/packages/extension/package.json
index 8347bf599..d96b8de5f 100644
--- a/packages/extension/package.json
+++ b/packages/extension/package.json
@@ -39,6 +39,7 @@
     "@endo/promise-kit": "^1.1.6",
     "@metamask/snaps-utils": "^8.3.0",
     "@metamask/utils": "^9.3.0",
+    "@ocap/errors": "workspace:^",
     "@ocap/kernel": "workspace:^",
     "@ocap/shims": "workspace:^",
     "@ocap/streams": "workspace:^",
diff --git a/packages/extension/src/marshal.test.ts b/packages/extension/src/marshal.test.ts
new file mode 100644
index 000000000..90598e255
--- /dev/null
+++ b/packages/extension/src/marshal.test.ts
@@ -0,0 +1,17 @@
+import '@ocap/shims/endoify';
+import {
+  marshalError,
+  unmarshalError,
+  VatAlreadyExistsError,
+} from '@ocap/errors';
+import { describe, it, expect } from 'vitest';
+
+describe('marshal', () => {
+  it('should round trip a thrown error', async () => {
+    const thrown = new VatAlreadyExistsError('v123');
+    const marshaled = marshalError(thrown);
+    const received = unmarshalError(marshaled);
+
+    expect(received).toStrictEqual(thrown);
+  });
+});
diff --git a/yarn.lock b/yarn.lock
index 8312a704f..08b901b01 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1514,6 +1514,7 @@ __metadata:
     "@metamask/eslint-config-typescript": "npm:^14.0.0"
     "@metamask/snaps-utils": "npm:^8.3.0"
     "@metamask/utils": "npm:^9.3.0"
+    "@ocap/errors": "workspace:^"
     "@ocap/kernel": "workspace:^"
     "@ocap/shims": "workspace:^"
     "@ocap/streams": "workspace:^"