Added a few test code

ovsbridge_test.go

@@ -1 +1,10 @@
 package goovs
+
+import (
+    "testing"
+)
+
+func TestBridgeExists(t *testing.T) {
+    brname := "nonexistentbr"
+
+}

ovsclient.go

@@ -56,6 +56,7 @@ type OvsClient interface {
 	FindAllPortsOnBridge(brname string) ([]string, error)
 	PortExistsOnBridge(portname, brname string) (bool, error)
 	RemoveInterfaceFromPort(portname, interfaceUUID string) error
+	Disconnect()
 }
 
 type ovsClient struct {
@@ -127,6 +128,10 @@ func GetOVSClient(contype, endpoint string) (OvsClient, error) {
 	return client, nil
 }
 
+func (client *ovsClient) Disconnect() {
+	client.dbClient.Disconnect()
+}
+
 func (client *ovsClient) transact(operations []libovsdb.Operation, action string) error {
 	reply, _ := client.dbClient.Transact(defaultOvsDB, operations...)
 

ovsclient_test.go

@@ -1 +1,14 @@
 package goovs
+
+import (
+    "testing"
+)
+
+func preparingEnv() OvsClient{
+    client, _ := GetOVSClient("tcp", "ovs:6640")
+    return client
+}
+
+func tearDown(client OvsClient) {
+    client.Disconnect()
+}