From 00d38ee58843ebd6b63eda7c6db1244126ee3dd2 Mon Sep 17 00:00:00 2001
From: ytj-zuel <15623621570>
Date: Mon, 6 Jul 2026 14:00:24 +0800
Subject: [PATCH] test: add unit tests for ChatCommandPrefix

Adds a small, focused, additive unit-test file (test/chat-command-prefix.test.ts).
No existing files are modified or removed. yarn test:ci passes locally.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 test/chat-command-prefix.test.ts | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 test/chat-command-prefix.test.ts

diff --git a/test/chat-command-prefix.test.ts b/test/chat-command-prefix.test.ts
new file mode 100644
index 00000000000..ebd7ddc15c1
--- /dev/null
+++ b/test/chat-command-prefix.test.ts
@@ -0,0 +1,28 @@
+// app/command.ts imports app/locales, which participates in an import cycle,
+// so a static import can hit a temporal-dead-zone error. Load it dynamically.
+let ChatCommandPrefix: RegExp;
+
+beforeAll(async () => {
+  // Warm up the import cycle in a working order before loading the target.
+  await import("../app/client/api");
+  ({ ChatCommandPrefix } = await import("../app/command"));
+});
+
+describe("ChatCommandPrefix", () => {
+  test("matches a leading ASCII colon", () => {
+    expect(ChatCommandPrefix.test(":help")).toBe(true);
+  });
+
+  test("matches a leading full-width (CJK) colon", () => {
+    expect(ChatCommandPrefix.test("：help")).toBe(true);
+  });
+
+  test("does not match when the colon is not at the start", () => {
+    expect(ChatCommandPrefix.test("help:me")).toBe(false);
+  });
+
+  test("does not match plain text", () => {
+    expect(ChatCommandPrefix.test("hello")).toBe(false);
+    expect(ChatCommandPrefix.test("")).toBe(false);
+  });
+});