Allow empty bonus, salesFrequency, dateAdded, sort (#2)

This is required by the schema, so the library must cover it as well.

.travis.yml

@@ -3,7 +3,7 @@ language: php
 php:
   - 5.6
   - 7.0
-  - hhvm
+  - 7.1
 
 install: composer install
 script: phpunit --configuration phpunit.xml --coverage-text

composer.json

@@ -1,6 +1,7 @@
 {
     "name": "findologic/libflexport",
     "description": "FINDOLOGIC export toolkit for XML and CSV data export",
+    "version": "0.0.2",
     "require-dev": {
         "phpunit/phpunit": "~5.6",
         "goetas-webservices/xsd2php":"^0.2"

src/FINDOLOGIC/Export/Data/Item.php

@@ -56,6 +56,10 @@ public function __construct($id)
 
         $this->keywords = new AllKeywords();
         $this->ordernumbers = new AllOrdernumbers();
+        $this->bonus = new Bonus();
+        $this->salesFrequency = new SalesFrequency();
+        $this->dateAdded = new DateAdded();
+        $this->sort = new Sort();
     }
 
     public function setName(Name $name)

tests/FINDOLOGIC/Tests/XmlSerializationTest.php

@@ -76,22 +76,6 @@ private function getMinimalItem()
         $url->setValue('http://example.org/my-awesome-product.html');
         $item->setUrl($url);
 
-        $bonus = new Bonus();
-        $bonus->setValue(3);
-        $item->setBonus($bonus);
-
-        $salesFrequency = new SalesFrequency();
-        $salesFrequency->setValue(42);
-        $item->setSalesFrequency($salesFrequency);
-
-        $dateAdded = new DateAdded();
-        $dateAdded->setDateValue(new \DateTime());
-        $item->setDateAdded($dateAdded);
-
-        $sort = new Sort();
-        $sort->setValue(2);
-        $item->setSort($sort);
-
         return $item;
     }