29
loading...
TIL: Skipping Tests in Go
The Go testing framework and toolchain has a nifty facility, where you can skip tests, if you do not want them to be a part of every run.
Let say we have a basic implementation
package shorttest
import (
"fmt"
"time"
)
func DoUnimportantStuff() uint8 {
fmt.Println("Doing unimportant stuff")
time.Sleep(10 * time.Second)
return 1
}
func DoImportantStuff() uint8 {
fmt.Println("Doing important stuff")
return 1
}And we have a corresponding test suite:
package shorttest
import "testing"
func TestImportant(t *testing.T) {
got := DoImportantStuff()
if got != 1 {
t.Errorf("Important stuff not correct, needed %d", got)
}
}
func TestUnimportant(t *testing.T) {
if testing.Short() {
t.Skip("skipping test in short mode.")
} else {
got := DoUnimportantStuff()
if got != 1 {
t.Errorf("Unimportant stuff not correct, needed %d", got)
}
}
}When we are developing and want fast feedback, we do not want to wait for the long running and unimportant test to finish, but we are VERY interested in getting feedback on our important function as fast as possible.
When we just test we will observe waiting time
$ go test
Doing important stuff
Doing unimportant stuff
PASS
ok shorttest 10.364sWe can then skip the execution of the unimportant tests by executing our test suite with the
--short flag.❯ go test --short
Doing important stuff
PASS
ok shorttest 0.116sWe just have to remember to add the handling of
--short via testing.Short() in the non-critical and long running tests.Lifted from my TIL collection
29