How to use Inversify with Mocha

Question

I'm using Inversify for Dependency Injection in my TypeScript Node.js application. This works great when actually running the app.

However, the @injectable() annotation seems to have crippled my tests. When running tests, I now get an error saying:

TypeError: Reflect.hasOwnMetadata is not a function

I've seen this before, and was helped by this other SO answer: https://stackoverflow.com/a/43115660/4003671

However, importing inversify.config does not solve the problem in my tests. If I remove the @injectable() annotation from the class I'm testing, then the tests run.

I don't actually need DI in my tests, so somehow disabling it would be an acceptable solution.

Has anyone seen this before?

Answer 1

Think I've got it. Importing my entire inversify.config didn't work, but if I specifically import "reflect-metadata" at the top of my unit test, it's all dandy.