test(tests): tests for vacuum region

Test suite has been updated to include a much more robust suite of tools for validating mesh quality and mesh usability (including but not limited to things such as validating that integrating over a sphere provides the correct volume, that the mesh is confirming, and that no elements are inverted)

tests/sandbox/default.toml

@@ -0,0 +1,15 @@
+[main]
+core_steepness = 1.0
+flattening = 0.0
+include_external_domain = true
+inf_bdr_id = 2
+order = 3
+r_core = 1.5
+r_infinity = 10.0
+r_instability = 1e-14
+r_star = 5.0
+refinement_levels = 2
+surface_bdr_id = 1
+core_id = 1
+envelope_id = 2
+vacuum_id = 3

tests/sandbox/meson.build

@@ -0,0 +1 @@
+executable('sandbox_test', 'sandbox_test.cpp', dependencies: [stroid_dep])

tests/sandbox/sandbox_test.cpp

@@ -0,0 +1,37 @@
+#include "fourdst/config/config.h"
+#include "stroid/config/config.h"
+#include "stroid/IO/mesh.h"
+#include "stroid/topology/curvilinear.h"
+#include "stroid/topology/mapping.h"
+#include "stroid/topology/topology.h"
+
+#include "mfem.hpp"
+
+#include <print>
+
+struct SandboxConfig {
+    std::string host = "localhost";
+    int port = 19916;
+    bool visualize = true;
+};
+
+using MeshConfig = fourdst::config::Config<stroid::config::MeshConfig>;
+using UserConfig = fourdst::config::Config<SandboxConfig>;
+
+int main() {
+    MeshConfig mesh_cfg;
+    mesh_cfg.load("default.toml");
+
+    UserConfig user_cfg;
+
+
+    std::unique_ptr<mfem::Mesh> mesh = stroid::topology::BuildSkeleton(mesh_cfg);
+    stroid::topology::Finalize(*mesh, mesh_cfg);
+    stroid::topology::PromoteToHighOrder(*mesh, mesh_cfg);
+    stroid::topology::ProjectMesh(*mesh, mesh_cfg);
+    stroid::IO::ViewMesh(*mesh, "Sandbox Mesh", stroid::IO::VISUALIZATION_MODE::ELEMENT_ID, user_cfg->host, user_cfg->port);
+
+     return 0;
+
+
+}