Provider Tests

~~OneSubscriptionMultipleGetUpdateCalls~~
~~OneUnSubscribeMultipleObservableDisposes~~
~~GetUpdateCallsGetInitialValue~~
~~GetUpdatesCallsSubscribe~~

FreeAgentProvider Tests

PublishedMessageIsSerialisedBeforeSent
DisposeLogsOut
InitialiseLogsIn

CreateExpenseMessageSerailisation
DeleteExpenseMessageSerailisation
UpdateExpenseMessageSerailisation
GetListOfExpensesMessageSerailisation

GetAttachmentCommand
SendExpenseCommand