How to test install scripts?

[bilogic]

Totally new to bats-core

1. I'm looking to add tests to https://github.com/mail-in-a-box/mailinabox
2. Any idea how I can test a command like apt install php8.2?
3. And in the course of testing, does apt install php8.2 actually runs?

[meleu]

My approach for situations like this:

I'm not the apt maintainer, then I don't test its behavior. I just trust that it will behave as expected.

What I really want to test is if my code calls apt correctly. In such case I would do something like this (inside my .bats file):

#!/usr/bin/env bats

@test "my_function calls apt correctly" {
  # Create a function with the same name of the external tool to mock its behavior
  apt() {
    if [[ $* == 'install php8.2' ]]; then
      echo "mocked output"
    else
      return 1
    fi
  }
  export -f apt

  run my_function
  assert_output --partial "mocked output"
}