Add util

util/net/net_test.go

@@ -0,0 +1,21 @@
+package net
+
+import (
+	"net"
+	"testing"
+)
+
+func TestListen(t *testing.T) {
+	fn := func(addr string) (net.Listener, error) {
+		return net.Listen("tcp", addr)
+	}
+
+	// try to create a number of listeners
+	for i := 0; i < 10; i++ {
+		l, err := Listen("localhost:10000-11000", fn)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer l.Close()
+	}
+}