How to share class variable between a unit test and another class?

How can I avoid having to call this extra method when running my unit test? I want somehow to have that context object created in the constructor to be used in the unit test

  [TestMethod]
    public void Delete_Sp_List()
    {
        ctx = tf.GetContext();
        List list = ctx.Web.Lists.GetByTitle("StackTicketList");
        list.DeleteObject();
        ctx.ExecuteQuery();
    }


   public TicketForm()
    {
        SecureString ssPwd = new SecureString();
        strPassword.ToList().ForEach(ssPwd.AppendChar);
        SharePointOnlineCredentials credentials = new SharePointOnlineCredentials(strUserName, ssPwd);
        ctx.Credentials = credentials;
    }

    public ClientContext GetContext()
    {
        SecureString ssPwd = new SecureString();
        strPassword.ToList().ForEach(ssPwd.AppendChar);
        SharePointOnlineCredentials credentials = new SharePointOnlineCredentials(strUserName, ssPwd);
        ctx.Credentials = credentials;

        return ctx;
    }