Another motivation I have heard used is that an os.Exit() from main
by-passes defer(). So if you need to use defer from a "main-like" context
move it to a function called from main(), do your defer(s) in it and then
do the os.Exit() from main()..
On Friday 16 February 2024 at 01:23:57 UTC-8 Marcello H wrote:
> My main acts just like a mini bootstrap to do as less as possible and hand
> the real action over to start.Run()
> But is is still testable.
>
> ```
>
> var mainRunner = runner
>
> /* -------------------------- Methods/Functions ---------------------- */
>
> // runner starts the application and can be overwritten in a test for
> mocking.
> func runner() error {
> return start.Run() //nolint:wrapcheck // not needed here
> }
>
> /*
> main is the bootstrap of the application.
> */
> func main() {
> err := mainRunner()
> if err != nil {
> fmt.Println("Error:\n", libErrors.GetError(err))
> }
> }
> ```
> In an internal test, the mainRunner is mocked and can emulate an error if
> needed.
> func Test_Main_Error(t *testing.T) {
> mainRunner = func() error {
> return errors.New("test error")
> }
>
> defer func() {
> mainRunner = runner
> }()
>
> captured := libCapture.Direct(func() {
> main()
> })
>
> assert.Contains(t, captured, "test error")
> }
>
> Op donderdag 15 februari 2024 om 10:05:11 UTC+1 schreef Brian Candler:
>
>> On Thursday 15 February 2024 at 00:08:44 UTC Jerry Londergaard wrote:
>>
>> If code is outside of the main function but still in the main package, it
>> seems its testable like other functions?
>>
>>
>> Yes indeed.
>>
>>
>> I suspect though if one is putting tests in package main_test, then I
>> guess you can't import the main package to test it :(
>>
>>
>> Works fine as far as I can see:
>> https://go.dev/play/p/7UtYP2j8hg6
>>
>> (Tests don't run in the playground, unless you explicitly invoke a
>> runner, but you can run this locally to demonstrate)
>>
>
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