fix: chat stream resp error (#259)

chat_stream_test.go

@@ -204,6 +204,57 @@ func TestCreateChatCompletionStreamError(t *testing.T) {
 	t.Logf("%+v\n", apiErr)
 }
 
+func TestCreateChatCompletionStreamRateLimitError(t *testing.T) {
+	server := test.NewTestServer()
+	server.RegisterHandler("/v1/chat/completions", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(429)
+
+		// Send test responses
+		dataBytes := []byte(`{"error":{` +
+			`"message": "You are sending requests too quickly.",` +
+			`"type":"rate_limit_reached",` +
+			`"param":null,` +
+			`"code":"rate_limit_reached"}}`)
+
+		_, err := w.Write(dataBytes)
+		checks.NoError(t, err, "Write error")
+	})
+	ts := server.OpenAITestServer()
+	ts.Start()
+	defer ts.Close()
+
+	// Client portion of the test
+	config := DefaultConfig(test.GetTestToken())
+	config.BaseURL = ts.URL + "/v1"
+	config.HTTPClient.Transport = &tokenRoundTripper{
+		test.GetTestToken(),
+		http.DefaultTransport,
+	}
+
+	client := NewClientWithConfig(config)
+	ctx := context.Background()
+
+	request := ChatCompletionRequest{
+		MaxTokens: 5,
+		Model:     GPT3Dot5Turbo,
+		Messages: []ChatCompletionMessage{
+			{
+				Role:    ChatMessageRoleUser,
+				Content: "Hello!",
+			},
+		},
+		Stream: true,
+	}
+
+	var apiErr *APIError
+	_, err := client.CreateChatCompletionStream(ctx, request)
+	if !errors.As(err, &apiErr) {
+		t.Errorf("TestCreateChatCompletionStreamRateLimitError did not return APIError")
+	}
+	t.Logf("%+v\n", apiErr)
+}
+
 // Helper funcs.
 func compareChatResponses(r1, r2 ChatCompletionStreamResponse) bool {
 	if r1.ID != r2.ID || r1.Object != r2.Object || r1.Created != r2.Created || r1.Model != r2.Model {