Is there a way to stub an ES6 class method using Mocha/Sinon?

I'm trying to do this...

sinon.stub(Factory, 'announce');

but I just get the following error...

TypeError: Attempted to wrap undefined property announce as function

Is there a way to stub an ES6 class method using Mocha/Sinon?

I'm trying to do this...

sinon.stub(Factory, 'announce');

but I just get the following error...

TypeError: Attempted to wrap undefined property announce as function

• javascript
• node.js
• mocha.js
• sinon
• stub

• 1 Shouldn't you pass Factory.prototype? I guess it's not a static method. – Bergi Commented May 27, 2016 at 0:01
• 1 I didn't realise that ES6 classes still used .prototype! Want to post an answer for me to accept? – michael Commented May 27, 2016 at 12:02

1 Answer 1

Instance methods are still placed on the prototype object of a class to be inherited from, not on its constructor, even if the class syntax obscures that a bit. Use

sinon.stub(Factory.prototype, 'announce');