Add unit test for createOrder method

Author: rachelmcr

Yosemite/YosemiteTests/Stores/OrderStoreTests.swift

@@ -671,6 +671,24 @@ final class OrderStoreTests: XCTestCase {
         // Then
         XCTAssertNotNil(storedOrder)
     }
+
+    func test_create_order_stores_orders_correctly() throws {
+        // Given
+        let store = OrderStore(dispatcher: dispatcher, storageManager: storageManager, network: network)
+        network.simulateResponse(requestUrlSuffix: "orders", filename: "order")
+
+        // When
+        let storedOrder: Yosemite.Order? = waitFor { promise in
+            let action = OrderAction.createOrder(siteID: self.sampleSiteID, order: self.sampleOrder()) { _ in
+                let order = self.storageManager.viewStorage.loadOrder(siteID: self.sampleSiteID, orderID: self.sampleOrderID)?.toReadOnly()
+                promise(order)
+            }
+            store.onAction(action)
+        }
+
+        // Then
+        XCTAssertNotNil(storedOrder)
+    }
 }