Unit Tests and Functional Tests for Invoicing

- Updated Unit Tests for PPModels used by Invoicing
- Updated Functional Tests
- Updated Samples for quick changes.

tests/PayPal/Test/Api/ErrorDetailsTest.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace PayPal\Test\Api;
+
+use PayPal\Common\PPModel;
+use PayPal\Api\ErrorDetails;
+
+/**
+ * Class ErrorDetails
+ *
+ * @package PayPal\Test\Api
+ */
+class ErrorDetailsTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Gets Json String of Object ErrorDetails
+     * @return string
+     */
+    public static function getJson()
+    {
+        return '{"field":"TestSample","issue":"TestSample"}';
+    }
+
+    /**
+     * Gets Object Instance with Json data filled in
+     * @return ErrorDetails
+     */
+    public static function getObject()
+    {
+        return new ErrorDetails(self::getJson());
+    }
+
+
+    /**
+     * Tests for Serialization and Deserialization Issues
+     * @return ErrorDetails
+     */
+    public function testSerializationDeserialization()
+    {
+        $obj = new ErrorDetails(self::getJson());
+        $this->assertNotNull($obj);
+        $this->assertNotNull($obj->getField());
+        $this->assertNotNull($obj->getIssue());
+        $this->assertEquals(self::getJson(), $obj->toJson());
+        return $obj;
+    }
+
+    /**
+     * @depends testSerializationDeserialization
+     * @param ErrorDetails $obj
+     */
+    public function testGetters($obj)
+    {
+        $this->assertEquals($obj->getField(), "TestSample");
+        $this->assertEquals($obj->getIssue(), "TestSample");
+    }
+
+    /**
+     * @depends testSerializationDeserialization
+     * @param ErrorDetails $obj
+     */
+    public function testDeprecatedGetters($obj)
+    {
+    }
+
+    /**
+     * @depends testSerializationDeserialization
+     * @param ErrorDetails $obj
+     */
+    public function testDeprecatedSetterNormalGetter($obj)
+    {
+
+        //Test All Deprecated Getters and Normal Getters
+        $this->testDeprecatedGetters($obj);
+        $this->testGetters($obj);
+    }
+
+
+
+}