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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package stacktest
import (
"testing"
"time"
"golang.org/x/tools/internal/stack"
)
//this is only needed to support pre 1.14 when testing.TB did not have Cleanup
type withCleanup interface {
Cleanup(func())
}
// the maximum amount of time to wait for goroutines to clean themselves up.
const maxWait = time.Second
// NoLeak checks that a test (or benchmark) does not leak any goroutines.
func NoLeak(t testing.TB) {
c, ok := t.(withCleanup)
if !ok {
return
}
before := stack.Capture()
c.Cleanup(func() {
var delta stack.Delta
start := time.Now()
delay := time.Millisecond
for {
after := stack.Capture()
delta = stack.Diff(before, after)
if len(delta.After) == 0 {
// no leaks
return
}
if time.Since(start) > maxWait {
break
}
time.Sleep(delay)
delay *= 2
}
// it's been long enough, and leaks are still present
summary := stack.Summarize(delta.After)
t.Errorf("goroutine leak detected:\n%+v", summary)
})
}
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