public void CreateTest()
{
var previewBillingPlan = new AccountsApi.CreateOptions()
{
previewBillingPlan = "true"
};
var newAccountDefinition = new NewAccountDefinition();
var response = instance.Create(newAccountDefinition, previewBillingPlan);
NUnit.Framework.Assert.IsInstanceOf <NewAccountSummary>(response, "response is NewAccountSummary");
}