MAGETWO-94269: PayPal advanced payments won't process payment due to an incorrect redirect after a silent post

- address code review comments

Author: Joan He

app/code/Magento/Paypal/Test/Unit/Controller/Payflow/ReturnUrlTest.php

@@ -200,7 +200,8 @@ public function testExecuteAllowedOrderState($state)
             ->willReturnSelf();
 
         $this->eventManagerMock->expects($this->once())
-            ->method('dispatch');
+            ->method('dispatch')
+            ->with('checkout_success', $this->arrayHasKey('order'));
 
         $result = $this->returnUrl->execute();
         $this->assertNull($result);

app/code/Magento/Signifyd/Observer/PlaceOrder.php

@@ -83,7 +83,7 @@ private function createCaseForOrder($order)
         $orderId = $order->getEntityId();
         if (null === $orderId
             || $order->getPayment()->getMethodInstance()->isOffline()
-            || $order->getState() == Order::STATE_PENDING_PAYMENT) {
+            || $order->getState() === Order::STATE_PENDING_PAYMENT) {
             return;
         }