fix(imessage): prevent rpc spawn in tests

src/imessage/client.test.ts

@@ -0,0 +1,22 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+const spawnMock = vi.hoisted(() => vi.fn());
+
+vi.mock("node:child_process", () => ({
+  spawn: (...args: unknown[]) => spawnMock(...args),
+}));
+
+describe("createIMessageRpcClient", () => {
+  beforeEach(() => {
+    spawnMock.mockReset();
+    vi.stubEnv("VITEST", "true");
+  });
+
+  it("refuses to spawn imsg rpc in test environments", async () => {
+    const { createIMessageRpcClient } = await import("./client.js");
+    await expect(createIMessageRpcClient()).rejects.toThrow(
+      /Refusing to start imsg rpc in test environment/i,
+    );
+    expect(spawnMock).not.toHaveBeenCalled();
+  });
+});