Add start of netlink unit tests

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)

netlink/netlink_linux_test.go

@@ -0,0 +1,28 @@
+package netlink
+
+import (
+	"net"
+	"testing"
+)
+
+func TestCreateBridgeWithMac(t *testing.T) {
+	name := "testbridge"
+
+	if err := CreateBridge(name, true); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := net.InterfaceByName(name); err != nil {
+		t.Fatal(err)
+	}
+
+	// cleanup and tests
+
+	if err := DeleteBridge(name); err != nil {
+		t.Fatal(err)
+	}
+
+	if _, err := net.InterfaceByName(name); err == nil {
+		t.Fatal("expected error getting interface because bridge was deleted")
+	}
+}