test.rb

# @order is created before each test runs
it "allows for the navision Id to be specified rather than the salesforce Id" do
  @order.Status__c.should eq('Processing')
  body = {
    :order => {
      :id => @order.Id,
      :Status__c => "Processed",
      :NavisionID__c => "testxxx_navision_id"
    }
  }
  post('/services/apexrest/orders/v1/', body)
  @order.reload
  @order.Status__c.should eq('Processed')
  @order.NavisionID__c.should eq('testxxx_navision_id')

  body = {
    :order => {
      :NavisionID__c => "testxxx_navision_id",
      :Status__c => "Shipped",
      :TrackingNumbers__c => "tracking1\ntracking2"
    }
  }
  post('/services/apexrest/orders/v1/', body)
  @order.reload
  @order.Status__c.should eq('Shipped')
  # After reloading the order from Salesforce, the Navision ID is still present.
  @order.NavisionID__c.should eq('testxxx_navision_id')
end