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

diff --git a/tests/graphviz_graph.cpp b/tests/graphviz_graph.cpp
index 9fbd80ff4cb2954dd5441e914408b48a2911a3ac..54ca7a665d6e0bf4939269641b51aa15b0d44608 100644 (file)
--- a/tests/graphviz_graph.cpp
+++ b/tests/graphviz_graph.cpp
@@ -43,6 +43,6 @@ const GraphvizEdge &GraphvizGraph::edge(std::string_view edgeop) const {
       return edge;
     }
   }
-  throw std::runtime_error("Unknown edge '" + std::string{edgeop} +
-                           "' in graph " + m_graph_id);
+  throw std::runtime_error{
+      fmt::format("Unknown edge '{}' in graph '{}'", edgeop, m_graph_id)};
 }