fix(tester): improve error handling

pkg/errors.go

@@ -0,0 +1,37 @@
+package pkg
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+var (
+	NoPermission       = errors.New("no permission")
+	ErrUnauthenticated = errors.New("unauthenticated")
+	ErrUnhandled       = errors.New("unhandled")
+	ErrNotFound        = errors.New("not found")
+	ErrBadInput        = errors.New("bad input")
+	ErrInternal        = errors.New("internal")
+)
+
+func Wrap(basic error, err error, op string, msg string) error {
+	return errors.Join(basic, err, fmt.Errorf("during %s: %s", op, msg))
+}
+
+func ToREST(err error) int {
+	switch {
+	case errors.Is(err, ErrUnauthenticated):
+		return http.StatusUnauthorized
+	case errors.Is(err, ErrBadInput):
+		return http.StatusBadRequest
+	case errors.Is(err, ErrNotFound):
+		return http.StatusNotFound
+	case errors.Is(err, ErrInternal):
+		return http.StatusInternalServerError
+	case errors.Is(err, NoPermission):
+		return http.StatusForbidden
+	}
+
+	return http.StatusInternalServerError
+}