Unit test for insert command

I'm new to unit testing and i need to test a insert command in my code. Can anyone please let me know how to do it.. Following is the method i want to test.

    public void InsertData()
    {        
        Connect();    
        query = "Insert into Person values ('"+ name +"','"+ address +"','"+ 
        phn +"')";            
        cmd = new SqlCommand(query, Conn);                      
        cmd.ExecuteNonQuery();
        DisConnect();
    }