testing/synctest: wrong duration in doc example #73839
Description
Go version
tip
Output of go env in your module/workspace:
Not relevantWhat did you do?
The documentation for testing/synctest at tip.golang.org says:
For example, this test runs immediately rather than taking two seconds:
func TestTime(t *testing.T) {
synctest.Test(t, func(t *testing.T) {
start := time.Now() // always midnight UTC 2001-01-01
go func() {
time.Sleep(1 * time.Nanosecond)
t.Log(time.Since(start)) // always logs "1ns"
}()
time.Sleep(2 * time.Nanosecond) // the goroutine above will run before this Sleep returns
t.Log(time.Since(start)) // always logs "2ns"
})
}
It is possible I am not very smart, and just totally misreading this. But I am confused how this could ever take two seconds to run, under normal conditions - the maximum sleep introduced is 2 nanoseconds, and the rest of the code should complete reasonably quickly (on the order of microseconds or milliseconds).
As a result, I'm not sure how synctest modifies the typical behavior of the program.
What did you see happen?
See above
What did you expect to see?
See above