Refactoring and Adding Tests (#58)

* Moving Identity seeding to its own class and method.

* Adding tests for AddItem

* Added catalog api controller and functional tests
Added and cleaned up some comments

* Adding integration tests for OrderRepository

* Getting integration test for order working with inmemory db

tests/UnitTests/Builders/AddressBuilder.cs

@@ -0,0 +1,28 @@
+using ApplicationCore.Entities.OrderAggregate;
+
+namespace UnitTests.Builders
+{
+    public class AddressBuilder
+    {
+        private Address _address;
+        public string TestStreet => "123 Main St.";
+        public string TestCity => "Kent";
+        public string TestState => "OH";
+        public string TestCountry => "USA";
+        public string TestZipCode => "44240";
+
+        public AddressBuilder()
+        {
+            _address = WithDefaultValues();
+        }
+        public Address Build()
+        {
+            return _address;
+        }
+        public Address WithDefaultValues()
+        {
+            _address = new Address(TestStreet, TestCity, TestState, TestCountry, TestZipCode);
+            return _address;
+        }
+    }
+}