I tried stubbing functions that were in a controller in an express app and when I called the controller function, assertions I wrote throws an error that the stubbed functions are not called or not called with the required arguments. Below is the test file. When I console.log(createUserStub) I get [Function: createUser]. Also, when I tried console.logging the newUser generated in the controller function, the result printed out shows that the actual internal function, createUser was called and not the stubbed function.