fix(mocks): handle OpenAPI 3.1 nullability

[arthurfiorette]

Status

READY

Description

Support for type: [X, null] into mocks. This PR is almost identical to the original one: https://github.com/anymaniax/orval/pull/645/files.

I reused the #645 spec to create this test.

Todos

• Tests
• Documentation
• Changelog Entry (unreleased)

Steps to Test or Reproduce

It previously generated the following:

export const getFetchNullableResponseMock = (): FetchNullable200 => ({})

Now its working as intended

export const getFetchNullableResponseMock = (): FetchNullable200 =>
  faker.helpers.arrayElement([faker.word.sample(), null]);