Stubbing route change (Gatsby)

[joshuacassidygrant]

My component under test has a button that navigates the user to another route. Obviously I do not want this to execute, so I'd like to stub it. I am not sure how to do this, and when I don't I get:
Uncaught TypeError: window.___navigate is not a function

I am using Gatsby and the button is (eventually) calling the Gatsby "navigate" function. I have tried using cy.stub on the module in question, and even on window.navigate but this doesn't seem to work. Does anyone have an easy way to do this?

Thank you!