Fix card serialization

src/LondonTravel.Skill/Models/Card.cs

@@ -1,8 +1,12 @@
 // Copyright (c) Martin Costello, 2017. All rights reserved.
 // Licensed under the Apache 2.0 license. See the LICENSE file in the project root for full license information.
 
+using System.Text.Json.Serialization;
+
 namespace MartinCostello.LondonTravel.Skill.Models;
 
+[JsonDerivedType(typeof(LinkAccountCard))]
+[JsonDerivedType(typeof(StandardCard))]
 public abstract class Card
 {
     public abstract string Type { get; set; }

test/LondonTravel.Skill.Tests/SerializationTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache 2.0 license. See the LICENSE file in the project root for full license information.
 
 using System.Text.Json;
+using MartinCostello.LondonTravel.Skill.Models;
 
 namespace MartinCostello.LondonTravel.Skill;
 
@@ -25,17 +26,99 @@ public static async Task Can_Deserialize_Request(string name)
         actual.Request.ShouldNotBeNull();
     }
 
-    [Theory]
-    [InlineData("SkillResponse")]
-    public static async Task Can_Deserialize_Response(string name)
+    [Fact]
+    public static void Can_Serialize_Response_With_No_Card()
     {
         // Arrange
-        string json = await File.ReadAllTextAsync(Path.Combine("Samples", $"{name}.json"));
+        var response = new SkillResponse()
+        {
+            Response = new()
+            {
+                OutputSpeech = new()
+                {
+                    Ssml = "<p>Hello, world!</p>",
+                },
+            },
+        };
 
         // Act
-        var actual = JsonSerializer.Deserialize(json, AppJsonSerializerContext.Default.ResponseBody);
+        string actual = JsonSerializer.Serialize(response, AppJsonSerializerContext.Default.SkillResponse);
 
         // Assert
         actual.ShouldNotBeNull();
+        using var document = JsonDocument.Parse(actual);
+
+        document.RootElement
+            .GetProperty("response")
+            .TryGetProperty("card", out _)
+            .ShouldBeFalse();
+    }
+
+    [Fact]
+    public static void Can_Serialize_Response_With_Link_Account_Card()
+    {
+        // Arrange
+        var response = new SkillResponse()
+        {
+            Response = new()
+            {
+                Card = new LinkAccountCard(),
+                OutputSpeech = new()
+                {
+                    Ssml = "<p>Hello, world!</p>",
+                },
+            },
+        };
+
+        // Act
+        string actual = JsonSerializer.Serialize(response, AppJsonSerializerContext.Default.SkillResponse);
+
+        // Assert
+        actual.ShouldNotBeNull();
+        using var document = JsonDocument.Parse(actual);
+
+        var card = document.RootElement
+            .GetProperty("response")
+            .GetProperty("card");
+
+        card.GetProperty("type").GetString().ShouldBe("LinkAccount");
+        card.EnumerateObject().Count().ShouldBe(1);
+    }
+
+    [Fact]
+    public static void Can_Serialize_Response_With_Standard_Card()
+    {
+        // Arrange
+        var response = new SkillResponse()
+        {
+            Response = new()
+            {
+                Card = new StandardCard()
+                {
+                    Content = "Hello, world!",
+                    Title = "Hello",
+                },
+                OutputSpeech = new()
+                {
+                    Ssml = "<p>Hello, world!</p>",
+                },
+            },
+        };
+
+        // Act
+        string actual = JsonSerializer.Serialize(response, AppJsonSerializerContext.Default.SkillResponse);
+
+        // Assert
+        actual.ShouldNotBeNull();
+        using var document = JsonDocument.Parse(actual);
+
+        var card = document.RootElement
+            .GetProperty("response")
+            .GetProperty("card");
+
+        card.GetProperty("type").GetString().ShouldBe("Standard");
+        card.GetProperty("title").GetString().ShouldBe("Hello");
+        card.GetProperty("text").GetString().ShouldBe("Hello, world!");
+        card.EnumerateObject().Count().ShouldBe(3);
     }
 }