Remove unnecessary test

relay/testec2/tun/tun_test.go

@@ -1,16 +0,0 @@
-package tun
-
-import "testing"
-
-func TestDevice_assignIP(t *testing.T) {
-	d := Device{
-		Name: "mytun0",
-		IP:   "10.0.0.1",
-	}
-	err := d.Up()
-	if err != nil {
-		t.Fatalf("failed to bring up device: %v", err)
-	}
-	defer d.Close()
-	select {}
-}