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// Copyright 2014 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 testing_test
import (
"fmt"
"os"
"runtime"
"testing"
"time"
)
func TestMain(m *testing.M) {
g0 := runtime.NumGoroutine()
code := m.Run()
if code != 0 {
os.Exit(code)
}
// Check that there are no goroutines left behind.
t0 := time.Now()
stacks := make([]byte, 1<<20)
for {
g1 := runtime.NumGoroutine()
if g1 == g0 {
return
}
stacks = stacks[:runtime.Stack(stacks, true)]
time.Sleep(50 * time.Millisecond)
if time.Since(t0) > 2*time.Second {
fmt.Fprintf(os.Stderr, "Unexpected leftover goroutines detected: %v -> %v\n%s\n", g0, g1, stacks)
os.Exit(1)
}
}
}
func TestContextCancel(t *testing.T) {
ctx := t.Context()
// Tests we don't leak this goroutine:
go func() {
<-ctx.Done()
}()
}
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