tests: work on adding integration tests

src/AnthropicClient/AnthropicApiClient.cs

@@ -213,6 +213,12 @@ public class AnthropicApiClient : IAnthropicApiClient
 
       if (line is null)
       {
+        if (string.IsNullOrWhiteSpace(currentEvent.Type) is false)
+        {
+          yield return currentEvent;
+          currentEvent = new AnthropicEvent();
+        }
+
         break;
       }
 

src/AnthropicClient/Models/ChatResponse.cs

@@ -26,13 +26,13 @@ public class ChatResponse
   /// Gets the stop reason of the chat response.
   /// </summary>
   [JsonPropertyName("stop_reason")]
-  public string StopReason { get; init; } = string.Empty;
+  public string? StopReason { get; init; }
 
   /// <summary>
   /// Gets the stop sequence of the chat response.
   /// </summary>
   [JsonPropertyName("stop_sequence")]
-  public string StopSequence { get; init; } = string.Empty;
+  public string? StopSequence { get; init; }
 
   /// <summary>
   /// Gets the type of the chat response.