Add Tests and Unit Test Structure to Generated Project

[basokant]

• Include an opinionated Go standard test project structure, and an example unit test.

Potential Ideas:

• Add a cli step and flag for this so the user could choose to have this be a part of the structure or not.
• Add some sort of option to include testify for a better test assertion experience https://github.com/stretchr/testify

[emilaleksanteri]

Yo if no one has taken this issue, can I add some unit tests for the steps etc?

[cedric-appdirect]

Would be interesting to setup a full DB with testcontainer-go or equivalent (when not selecting sqlite) for integration tests.