Tests: fix compiler warning about unused parameters

tests/src/App/ComplexGeoData.cpp

@@ -3,6 +3,7 @@
 #include "gtest/gtest.h"
 
 #include <array>
+#include <boost/core/ignore_unused.hpp>
 
 #include <App/Application.h>
 #include <App/ComplexGeoData.h>
@@ -480,6 +481,9 @@ TEST_F(ComplexGeoDataTest, traceElement)
     // Arrange
     Data::TraceCallback cb =
         [name](const Data::MappedName& elementname, int offset, long encodedTag, long tag) {
+            boost::ignore_unused(offset);
+            boost::ignore_unused(encodedTag);
+            boost::ignore_unused(tag);
             EXPECT_STREQ(elementname.toString().c_str(), name.substr(1).c_str());
             return false;
         };