[#1667] Changed IncludedIn to Is for one of the tests, to more fully cover the interface.
[#1667] Changed IncludedIn to Is for one of the tests, to more fully cover the interface.

scottmeyer/braintree_dotnet,scottmeyer/braintree_dotnet,ronin1/braintree_dotnet,ronin1/braintree_dotnet,braintree/braintree_dotnet,ronin1/braintree_dotnet,scottmeyer/braintree_dotnet,braintree/braintree_dotnet,scottmeyer/braintree_dotnet