Function test_io

tests/mesh/test-graph.cpp:123–129

}

void test_io( const geode::Graph& graph, const std::string& filename )
{
    geode::save_graph( graph, filename );
    const auto graph2 = geode::load_graph(
        geode::OpenGeodeGraph::impl_name_static(), filename );
    geode_unused( graph2 );
}

void test_backward_io( const std::string& filename )
{