tests: SVGAnalyzer: use fmt::format instead of string concatenation

diff --git a/tests/svg_analyzer.cpp b/tests/svg_analyzer.cpp
index d3361c9b94436695ec337be64db6eef7f10879c9..3f4017487b93026ada377640a6dd047f9a36c15d 100644 (file)
--- a/tests/svg_analyzer.cpp
+++ b/tests/svg_analyzer.cpp
@@ -165,7 +165,7 @@ void SVGAnalyzer::retrieve_graphviz_components_impl(
     } else if (class_ == "cluster") {
       // ignore for now
     } else {
-      throw std::runtime_error("Unknown class" + std::string{class_});
+      throw std::runtime_error{fmt::format("Unknown class {}", class_)};
     }
   }