Functional Tests Improvements and Refactoring

- Updated Functional Tests to refactor common code in one file
- Re-sets the credentials to make sure previous tests doesnt change it for testing

tests/PayPal/Test/Functional/Setup.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace PayPal\Test\Functional;
+
+use PayPal\Auth\OAuthTokenCredential;
+use PayPal\Core\PPCredentialManager;
+use PayPal\Rest\ApiContext;
+
+class Setup
+{
+
+    public static $mode = 'mock';
+
+    public static function SetUpForFunctionalTests(\PHPUnit_Framework_TestCase &$test)
+    {
+        $context = new ApiContext();
+        $context->setConfig(array(
+            'mode' => 'sandbox',
+            'acct1.ClientId' => 'AYSq3RDGsmBLJE-otTkBtM-jBRd1TCQwFf9RGfwddNXWz0uFU9ztymylOhRS',
+            'acct1.ClientSecret' => 'EGnHDxD_qRPdaLdZz8iCr8N7_MzF-YHPTkjs6NKYQvQSBngp4PTTVWkPZRbL',
+            'http.ConnectionTimeOut' => 30,
+            'log.LogEnabled' => true,
+            'log.FileName' => '../PayPal.log',
+            'log.LogLevel' => 'FINE',
+            'validation.level' => 'warning'
+        ));
+        PPCredentialManager::getInstance()->setCredentialObject(
+            new OAuthTokenCredential(
+                "AYSq3RDGsmBLJE-otTkBtM-jBRd1TCQwFf9RGfwddNXWz0uFU9ztymylOhRS",
+                "EGnHDxD_qRPdaLdZz8iCr8N7_MzF-YHPTkjs6NKYQvQSBngp4PTTVWkPZRbL"
+            )
+        );
+
+        self::$mode = getenv('REST_MODE') ? getenv('REST_MODE') : 'mock';
+        if (self::$mode != 'sandbox') {
+
+            // Mock PPRest Caller if mode set to mock
+            $test->mockPPRestCall = $test->getMockBuilder('\PayPal\Transport\PPRestCall')
+                ->disableOriginalConstructor()
+                ->getMock();
+
+            $test->mockPPRestCall->expects($test->any())
+                ->method('execute')
+                ->will($test->returnValue(
+                    $test->response
+                ));
+        }
+    }
+}