Errors When Running Tests

This troubleshooting guide covers common errors you may encounter when running tests in your Medusa application and how to resolve them.

Loaders for module Workflows failed#

If you get the following error when running your tests:

Terminal
❯Loaders for module Workflows failed: Method Map.prototype.set called on incompatible receiver #<Map>

This may occur if you have multiple test files and you don't configure your Jest environment correctly. To resolve this, add the following configuration to your jest.config.js file:

jest.config.js
1module.exports = {2  // ...3  setupFiles: ["./integration-tests/setup.js"],4}

Then, create the integration-tests/setup.js file with the following content:

integration-tests/setup.js
1const { MetadataStorage } = require("@medusajs/framework/mikro-orm/core")2
3MetadataStorage.clear()

Refer to the Testing Tools guide for more details.