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package syncutil
import (
"errors"
"testing"
)
func TestOnce(t *testing.T) {
timesRan := 0
f := func() error {
timesRan++
return nil
}
once := Once{}
grp := Group{}
for i := 0; i < 10; i++ {
grp.Go(func() error { return once.Do(f) })
}
if grp.Err() != nil {
t.Errorf("Expected no errors, got %v", grp.Err())
}
if timesRan != 1 {
t.Errorf("Expected to run one time, ran %d", timesRan)
}
}
// TestOnceErroring verifies we retry on every error, but stop after
// the first success.
func TestOnceErroring(t *testing.T) {
timesRan := 0
f := func() error {
timesRan++
if timesRan < 3 {
return errors.New("retry")
}
return nil
}
once := Once{}
grp := Group{}
for i := 0; i < 10; i++ {
grp.Go(func() error { return once.Do(f) })
}
if len(grp.Errs()) != 2 {
t.Errorf("Expected two errors, got %d", len(grp.Errs()))
}
if timesRan != 3 {
t.Errorf("Expected to run two times, ran %d", timesRan)
}
}
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