tests: add converter tests

src/StevesBot.Worker.Tests/Unit/DiscordEventConverterTests.cs

@@ -4,6 +4,8 @@ public class DiscordEventConverterTests
 {
   private readonly JsonSerializerOptions _options = new()
   {
+    ReferenceHandler = ReferenceHandler.IgnoreCycles,
+    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
     Converters =
     {
       new DiscordEventConverter()
@@ -12,36 +14,31 @@ public class DiscordEventConverterTests
   private readonly Type _discordEventType = typeof(DiscordEvent);
   private readonly DiscordEventConverter _converter = new();
 
-  [Fact]
-  public void Read_WhenCalledWithUnknownOpCode_ItShouldReturnDiscordEvent()
+  [Theory]
+  [MemberData(nameof(TestData))]
+  public void Read_WhenCalledWithOpCode_ItShouldReturnDiscordEvent(object data, Type expectedType)
   {
-    var data = new
-    {
-      op = 99,
-      s = null as int?,
-      t = null as string,
-      d = null as object
-    };
-
     var result = Read(data);
 
-    result.Should().BeOfType<DiscordEvent>();
+    result.Should().BeOfType(expectedType);
   }
 
   [Fact]
-  public void Read_WhenCalledWithDispatchOpCodeAndNoType_ItShouldReturnDispatchEvent()
+  public void Write_WhenCalledWithDiscordEvent_ItShouldReturnJson()
   {
-    var data = new
+    var discordEvent = new DiscordEvent
     {
-      op = DiscordOpCodes.Dispatch,
-      s = null as int?,
-      t = null as string,
-      d = null as object
+      OpCode = DiscordOpCodes.Dispatch,
+      Sequence = null,
+      Type = null,
+      Data = null
     };
 
-    var result = Read(data);
+    var result = JsonSerializer.Serialize(discordEvent, _options);
 
-    result.Should().BeOfType<DiscordEvent>();
+    var expectedJson = /*lang=json,strict*/ "{\"op\":0,\"s\":null,\"t\":null,\"d\":null}";
+
+    result.Should().Be(expectedJson);
   }
 
   private DiscordEvent? Read(object data)
@@ -51,4 +48,58 @@ public class DiscordEventConverterTests
     var reader = new Utf8JsonReader(utf8Json);
     return _converter.Read(ref reader, _discordEventType, _options);
   }
+
+  public static TheoryData<object, Type> TestData => new()
+  {
+    {
+      new
+      {
+        op = DiscordOpCodes.Hello,
+        s = null as int?,
+        t = null as string,
+        d = null as object,
+      },
+      typeof(HelloDiscordEvent)
+    },
+    {
+      new
+      {
+        op = DiscordOpCodes.Dispatch,
+        s = null as int?,
+        t = null as string,
+        d = null as object
+      },
+      typeof(DiscordEvent)
+    },
+    {
+      new
+      {
+        op = DiscordOpCodes.Dispatch,
+        s = null as int?,
+        t = DiscordEventTypes.Ready,
+        d = null as object
+      },
+      typeof(ReadyDiscordEvent)
+    },
+    {
+      new
+      {
+        op = DiscordOpCodes.HeartbeatAck,
+        s = null as int?,
+        t = null as string,
+        d = null as object
+      },
+      typeof(HeartbeatAckDiscordEvent)
+    },
+    {
+      new
+      {
+        op = -1,
+        s = null as int?,
+        t = null as string,
+        d = null as object
+      },
+      typeof(DiscordEvent)
+    }
+  };
 }

src/StevesBot.Worker.Tests/Usings.cs

@@ -1,6 +1,7 @@
 global using System.Net.WebSockets;
 global using System.Text;
 global using System.Text.Json;
+global using System.Text.Json.Serialization;
 
 global using Microsoft.AspNetCore.Builder;
 global using Microsoft.AspNetCore.Hosting;

src/StevesBot.Worker/Discord/Events/DiscordEventConverter.cs

@@ -2,12 +2,6 @@ namespace StevesBot.Worker.Discord.Events;
 
 internal sealed class DiscordEventConverter : JsonConverter<DiscordEvent>
 {
-  private readonly JsonSerializerOptions _jsonSerializerOptions = new()
-  {
-    ReferenceHandler = ReferenceHandler.IgnoreCycles,
-    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
-  };
-
   private const string OpPropertyName = "op";
 
   public override DiscordEvent? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
@@ -15,29 +9,46 @@ internal sealed class DiscordEventConverter : JsonConverter<DiscordEvent>
     using var jsonDoc = JsonDocument.ParseValue(ref reader);
     var root = jsonDoc.RootElement;
     var op = root.GetProperty(OpPropertyName).GetInt32();
+    var modifiedOptions = CopyAndRemoveConverter(options);
 
     return op switch
     {
-      DiscordOpCodes.Dispatch => DeserializeDispatchEvent(root, options),
+      DiscordOpCodes.Dispatch => DeserializeDispatchEvent(root, options, modifiedOptions),
       DiscordOpCodes.Hello => JsonSerializer.Deserialize<HelloDiscordEvent>(root.GetRawText(), options),
       DiscordOpCodes.HeartbeatAck => JsonSerializer.Deserialize<HeartbeatAckDiscordEvent>(root.GetRawText(), options),
-      _ => JsonSerializer.Deserialize<DiscordEvent>(root.GetRawText(), _jsonSerializerOptions),
+      _ => JsonSerializer.Deserialize<DiscordEvent>(root.GetRawText(), modifiedOptions),
     };
   }
 
   public override void Write(Utf8JsonWriter writer, DiscordEvent value, JsonSerializerOptions options)
   {
-    JsonSerializer.Serialize(writer, value, value.GetType(), options);
+    var modifiedOptions = CopyAndRemoveConverter(options);
+    JsonSerializer.Serialize(writer, value, value.GetType(), modifiedOptions);
   }
 
-  private DiscordEvent? DeserializeDispatchEvent(JsonElement root, JsonSerializerOptions options)
+  private static DiscordEvent? DeserializeDispatchEvent(JsonElement root, JsonSerializerOptions options, JsonSerializerOptions modifiedOptions)
   {
     var type = root.GetProperty("t").GetString();
 
     return type switch
     {
       DiscordEventTypes.Ready => JsonSerializer.Deserialize<ReadyDiscordEvent>(root.GetRawText(), options),
-      _ => JsonSerializer.Deserialize<DiscordEvent>(root.GetRawText(), _jsonSerializerOptions),
+      _ => JsonSerializer.Deserialize<DiscordEvent>(root.GetRawText(), modifiedOptions),
     };
   }
+
+  private static JsonSerializerOptions CopyAndRemoveConverter(JsonSerializerOptions options)
+  {
+    var newOptions = new JsonSerializerOptions(options);
+
+    foreach (var converter in options.Converters)
+    {
+      if (converter is DiscordEventConverter)
+      {
+        newOptions.Converters.Remove(converter);
+      }
+    }
+
+    return newOptions;
+  }
 }