Reusing spec.js files to reduce code and being more DRY

Current behavior:

1. Create e.g. a registration.spec.js (does a full registration process)
2. Create e.g. a offer.spec.js (does click on a offer link and starts booking, then coming to the register page and doing a full registration process)

Desired behavior:

1. Create e.g. a registration.spec.js (does a full registration process)
2. Create e.g. a offer.spec.js (does click on a offer link and imports the registration.spec.js)

Versions

Cypress 3.2.0 Ubuntu 18.04

Why that procedure?

Because I would like to reduce core. DRY principle. Is there a proper way to solve this. Or is rewriting specs and repeating stuff the best and already a proper way to solve this in cypress?

I was not able to find a good solution. The only way I could think of is to create a custom function. But with reusing spec.js files I think this would be more modular.

[cwellmer-daparto]

Afterwards I tried:

before(function() {
    require('registration.spec.js');
});

that says: Error: Cannot find module ‘registration.spec.js’ from ‘/opt/cypress/cypress/integration’

The spec file exists.

Do you have any idea? I’m totally out of ideas currently.

Use simplified:

require('/opt/cypress/cypress/integration/registration.spec.js')

or if you like it relative:

require('./registration.spec.js')

[kwoxer]

Would be awesome to get just one hint on this. I think this is important for all the developers who want to write clean code and reusing code fragments.