test: dedupe fixtures and test harness setup

extensions/test-utils/runtime-env.ts

@@ -0,0 +1,12 @@
+import type { RuntimeEnv } from "openclaw/plugin-sdk";
+import { vi } from "vitest";
+
+export function createRuntimeEnv(): RuntimeEnv {
+  return {
+    log: vi.fn(),
+    error: vi.fn(),
+    exit: vi.fn((code: number): never => {
+      throw new Error(`exit ${code}`);
+    }),
+  };
+}