initial commit

semaphore_test.go

@@ -0,0 +1,36 @@
+package commander
+
+import (
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewSemaphore(t *testing.T) {
+	t.Parallel()
+
+	sem := NewSemaphore(2)
+
+	var locked atomic.Uint32
+
+	for i := 0; i < 3; i++ {
+		go func() {
+			sem.Acquire()
+			locked.Add(1)
+		}()
+	}
+
+	time.Sleep(time.Microsecond * 10)
+
+	require.Equal(t, uint32(2), locked.Load())
+
+	sem.Release()
+	time.Sleep(time.Microsecond)
+
+	require.Equal(t, uint32(3), locked.Load())
+
+	sem.Release()
+	sem.Release()
+}