Updated Invoicing APIs

- Updated Model objects.
- Updated Samples.
- Updated Tests.

tests/PayPal/Test/Api/FileAttachmentTest.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace PayPal\Test\Api;
+
+use PayPal\Common\PayPalModel;
+use PayPal\Api\FileAttachment;
+
+/**
+ * Class FileAttachment
+ *
+ * @package PayPal\Test\Api
+ */
+class FileAttachmentTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Gets Json String of Object FileAttachment
+     * @return string
+     */
+    public static function getJson()
+    {
+        return '{"name":"TestSample","url":"http://www.google.com"}';
+    }
+
+    /**
+     * Gets Object Instance with Json data filled in
+     * @return FileAttachment
+     */
+    public static function getObject()
+    {
+        return new FileAttachment(self::getJson());
+    }
+
+
+    /**
+     * Tests for Serialization and Deserialization Issues
+     * @return FileAttachment
+     */
+    public function testSerializationDeserialization()
+    {
+        $obj = new FileAttachment(self::getJson());
+        $this->assertNotNull($obj);
+        $this->assertNotNull($obj->getName());
+        $this->assertNotNull($obj->getUrl());
+        $this->assertEquals(self::getJson(), $obj->toJson());
+        return $obj;
+    }
+
+    /**
+     * @depends testSerializationDeserialization
+     * @param FileAttachment $obj
+     */
+    public function testGetters($obj)
+    {
+        $this->assertEquals($obj->getName(), "TestSample");
+        $this->assertEquals($obj->getUrl(), "http://www.google.com");
+    }
+
+    /**
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage Url is not a fully qualified URL
+     */
+    public function testUrlValidationForUrl()
+    {
+        $obj = new FileAttachment();
+        $obj->setUrl(null);
+    }
+
+}