GA block update

Author: DomPixie

app/code/Magento/GoogleGtag/Test/Unit/Block/GaTest.php

@@ -166,7 +166,8 @@ public function testOrderTrackingData()
                     'affiliation' => 'test',
                     'value' => 10.00,
                     'tax' => 2.00,
-                    'shipping' => 1.00
+                    'shipping' => 1.00,
+                    'currency' => 'USD'
                 ]
             ],
             'products' => [