MAGETWO-58162: PayPal Payflow Pro always using USD (even if this currency is absent on your store)

- Fixed unit test

Author: rliukshyn

app/code/Magento/Paypal/Test/Unit/Model/Payflow/TransparentTest.php

@@ -122,7 +122,7 @@ protected function initializationAuthorizeMock()
         $this->orderMock = $this->getMockBuilder(\Magento\Sales\Model\Order::class)
             ->setMethods([
                 'getCustomerId', 'getBillingAddress', 'getShippingAddress', 'getCustomerEmail',
-                'getId', 'getIncrementId'
+                'getId', 'getIncrementId', 'getBaseCurrencyCode'
             ])
             ->disableOriginalConstructor()
             ->getMock();
@@ -164,6 +164,9 @@ protected function buildRequestData()
         $this->paymentMock->expects($this->once())
             ->method('getOrder')
             ->willReturn($this->orderMock);
+        $this->orderMock->expects($this->once())
+            ->method('getBaseCurrencyCode')
+            ->willReturn('USD');
         $this->orderMock->expects($this->once())
             ->method('getBillingAddress')
             ->willReturn($this->addressBillingMock);