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

src/Web/Controllers/Api/BaseApiController.cs

@@ -0,0 +1,10 @@
+using Microsoft.eShopWeb.Services;
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.Controllers.Api
+{
+    [Route("api/[controller]/[action]")]
+    public class BaseApiController : Controller
+    { }
+}

src/Web/Controllers/Api/CatalogController.cs

@@ -0,0 +1,21 @@
+using Microsoft.eShopWeb.Services;
+using Microsoft.AspNetCore.Mvc;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.Controllers.Api
+{
+    public class CatalogController : BaseApiController
+    {
+        private readonly ICatalogService _catalogService;
+
+        public CatalogController(ICatalogService catalogService) => _catalogService = catalogService;
+
+        [HttpGet]
+        public async Task<IActionResult> List(int? brandFilterApplied, int? typesFilterApplied, int? page)
+        {
+            var itemsPage = 10;           
+            var catalogModel = await _catalogService.GetCatalogItems(page ?? 0, itemsPage, brandFilterApplied, typesFilterApplied);
+            return Ok(catalogModel);
+        }
+    }
+}