alt Hacker NewsThis is all possible and quite neat to dive into the specifics, but if you really want to be able swap a std lib call, just turn it into a variable and change it.
// code.go
var now = time.Now
// code_test.go
func TestCode(t *testing.T) {
nowSwap := now
t.Cleanup (func() {
now = nowSwap
}
now = func() time.Time {
return time.Date(...)
}
}
Replies
metadat • today at 5:03 PM
That is a useful pattern, though I was unclear on why `t.Cleanup` and not `defer`. In case others are curious, too:
> Parallel subtestsWith t.Run(..., func(t testing.T) { t.Parallel(); ... }), the parent test function can return (and thus run its defers) before parallel subtests actually finish.*
antonvs • today at 4:24 PM
The point of the OP is that it changes calls to `time.Now` regardless of whether the code that's calling it uses your variable or not.
➕ show 1 reply
This is often the path of pain: https://google.github.io/styleguide/go/best-practices#global....