SDK: Fix typo in test package error message (#6331)

Signed-off-by: Anders Eknert <[email protected]>

sdk/test/test.go

@@ -28,7 +28,7 @@ import (
 func MockBundle(file string, policies map[string]string) func(*Server) error {
 	return func(s *Server) error {
 		if !strings.HasPrefix(file, "/bundles/") {
-			return fmt.Errorf("mock bundle filename must be prefixed with '/bundle/ but got %q", file)
+			return fmt.Errorf("mock bundle filename must be prefixed with '/bundles/ but got %q", file)
 		}
 		s.bundles[file] = policies
 		return nil