diff --git a/test/assign.test.ts b/test/assign.test.ts
index 64ddf94..74615d3 100644
--- a/test/assign.test.ts
+++ b/test/assign.test.ts
@@ -1,14 +1,13 @@
 import { describe, it } from 'node:test';
 import assert from 'node:assert/strict';
-import { mo, workers, assign } from 'moroutine';
-
-const double = mo(import.meta, (n: number): number => n * 2);
+import { workers, assign } from 'moroutine';
+import { identity } from './fixtures/worker-handle.ts';
 
 describe('assign()', () => {
   it('returns a new task with worker set', () => {
     const run = workers(1);
     try {
-      const task = double(5);
+      const task = identity(5);
       const assigned = assign(run.workers[0], task);
       assert.notStrictEqual(assigned, task);
       assert.equal(assigned.id, task.id);
@@ -23,7 +22,7 @@ describe('assign()', () => {
   it('does not modify the original task', () => {
     const run = workers(1);
     try {
-      const task = double(5);
+      const task = identity(5);
       assign(run.workers[0], task);
       assert.equal(task.worker, undefined);
     } finally {