Inspired by dotnet show (#386)

* Changed the order of the projects, Web first to infer as startup.

* Added encapsulated JSON serialization - and moved to System.Text.Json

* Refactored a few minor updates out

Co-authored-by: Eric Fleming <eric-fleming18@hotmail.com>

tests/FunctionalTests/Web/Controllers/ApiCatalogControllerList.cs

@@ -25,7 +25,7 @@ namespace Microsoft.eShopWeb.FunctionalTests.Web.Controllers
             var response = await Client.GetAsync("/api/catalog/list");
             response.EnsureSuccessStatusCode();
             var stringResponse = await response.Content.ReadAsStringAsync();
-            var model = JsonSerializer.Deserialize<CatalogIndexViewModel>(stringResponse, _jsonOptions);
+            var model = stringResponse.FromJson<CatalogIndexViewModel>();
 
             Assert.Equal(10, model.CatalogItems.Count());
         }
@@ -36,7 +36,7 @@ namespace Microsoft.eShopWeb.FunctionalTests.Web.Controllers
             var response = await Client.GetAsync("/api/catalog/list?page=1");
             response.EnsureSuccessStatusCode();
             var stringResponse = await response.Content.ReadAsStringAsync();
-            var model = JsonSerializer.Deserialize<CatalogIndexViewModel>(stringResponse, _jsonOptions);
+            var model = stringResponse.FromJson<CatalogIndexViewModel>();
 
             Assert.Equal(2, model.CatalogItems.Count());
         }

tests/UnitTests/ApplicationCore/Extensions/JsonExtensions.cs

@@ -0,0 +1,36 @@
+using Xunit;
+
+namespace Microsoft.eShopWeb.UnitTests.ApplicationCore.Extensions
+{
+    public class JsonExtensions
+    {
+        [Fact]
+        public void CorrectlySerializesAndDeserializesObject()
+        {
+            var testParent = new TestParent
+            {
+                Id = 7,
+                Name = "Test name",
+                Children = new[]
+                {
+                    new TestChild(),
+                    new TestChild(),
+                    new TestChild()
+                }
+            };
+
+            var json = testParent.ToJson();
+            var result = json.FromJson<TestParent>();
+            Assert.Equal(testParent, result);
+        }
+
+        [
+            Theory,
+            InlineData("{ \"id\": 9, \"name\": \"Another test\" }", 9, "Another test"),
+            InlineData("{ \"id\": 3124, \"name\": \"Test Value 1\" }", 3124, "Test Value 1"),
+        ]
+        public void CorrectlyDeserializesJson(string json, int expectedId, string expectedName) =>
+            Assert.Equal(new TestParent { Id = expectedId, Name = expectedName }, json.FromJson<TestParent>());
+
+    }
+}

tests/UnitTests/ApplicationCore/Extensions/TestChild.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Microsoft.eShopWeb.UnitTests.ApplicationCore.Extensions
+{
+    [DebuggerDisplay("Id={Id}, Date={Date}")]
+    public class TestChild : IEquatable<TestChild>
+    {
+        public Guid Id { get; set; } = Guid.NewGuid();
+
+        public DateTime Date { get; set; } = DateTime.UtcNow;
+
+        public bool Equals([AllowNull] TestChild other) =>
+            other?.Date == Date && other?.Id == Id;
+    }
+}

tests/UnitTests/ApplicationCore/Extensions/TestParent.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+
+namespace Microsoft.eShopWeb.UnitTests.ApplicationCore.Extensions
+{
+    public class TestParent : IEquatable<TestParent>
+    {
+        public int Id { get; set; }
+
+        public string Name { get; set; }
+
+        public IEnumerable<TestChild> Children { get; set; }
+
+        public bool Equals([AllowNull] TestParent other) =>
+            other?.Id == Id && other?.Name == Name &&
+            (other?.Children is null && Children is null ||
+            (other?.Children?.Zip(Children)?.All(t => t.First?.Equals(t.Second) ?? false) ?? false));
+    }
+}