refactor(*): 平台架构 - 拆分后端领域模块并同步插件协议与模型能力

backend/internal/app/worker_runtime_test.go

@@ -0,0 +1,27 @@
+package app
+
+import (
+	"errors"
+	"testing"
+
+	"infinite-canvas/backend/internal/platform"
+)
+
+func TestTaskWritesAreRejectedDuringDrain(t *testing.T) {
+	runtime := &platform.Worker{}
+	runtime.Start()
+	runtime.BeginDrain()
+	svc := &Service{workers: runtime}
+
+	if _, err := svc.CreateTask("user-1", CreateTaskRequest{}); !isAppErrorStatus(err, 503) {
+		t.Fatalf("CreateTask during drain error = %v, want 503", err)
+	}
+	if _, err := svc.RetryTask("user-1", "task-1"); !isAppErrorStatus(err, 503) {
+		t.Fatalf("RetryTask during drain error = %v, want 503", err)
+	}
+}
+
+func isAppErrorStatus(err error, status int) bool {
+	var appErr *AppError
+	return errors.As(err, &appErr) && appErr.Status == status
+}