github.com/bhameyie/otto@v0.2.1-0.20160406174117-16052efa52ec/helper/semaphore/semaphore_test.go (about)

     1  package semaphore
     2  
     3  import (
     4  	"testing"
     5  	"time"
     6  )
     7  
     8  func TestSemaphore(t *testing.T) {
     9  	s := New(2)
    10  	timer := time.AfterFunc(time.Second, func() {
    11  		panic("deadlock")
    12  	})
    13  	defer timer.Stop()
    14  
    15  	s.Acquire()
    16  	if !s.TryAcquire() {
    17  		t.Fatalf("should acquire")
    18  	}
    19  	if s.TryAcquire() {
    20  		t.Fatalf("should not acquire")
    21  	}
    22  	s.Release()
    23  	s.Release()
    24  
    25  	// This release should panic
    26  	defer func() {
    27  		r := recover()
    28  		if r == nil {
    29  			t.Fatalf("should panic")
    30  		}
    31  	}()
    32  	s.Release()
    33  }