Temp (#123)

* Coverage

* added fixes

* removed spacing

* removed junk

* removed print

* removed coverage

* removed useless stuff

* fix

---------

Co-authored-by: Saikari <lin@sz.cn.eu.org>

tests/general/unit_test_navigation_mesh.cpp

@@ -0,0 +1,33 @@
+#include <gtest/gtest.h>
+#include "omath/pathfinding/navigation_mesh.hpp"
+
+using namespace omath;
+using namespace omath::pathfinding;
+
+TEST(NavigationMeshTests, SerializeDeserializeRoundTrip)
+{
+    NavigationMesh nav;
+    Vector3<float> a{0.f,0.f,0.f};
+    Vector3<float> b{1.f,0.f,0.f};
+    Vector3<float> c{0.f,1.f,0.f};
+
+    nav.m_vertex_map.emplace(a, std::vector<Vector3<float>>{b,c});
+    nav.m_vertex_map.emplace(b, std::vector<Vector3<float>>{a});
+    nav.m_vertex_map.emplace(c, std::vector<Vector3<float>>{a});
+
+    auto data = nav.serialize();
+    NavigationMesh nav2;
+    EXPECT_NO_THROW(nav2.deserialize(data));
+
+    // verify neighbors preserved
+    EXPECT_EQ(nav2.m_vertex_map.size(), nav.m_vertex_map.size());
+    EXPECT_EQ(nav2.get_neighbors(a).size(), 2u);
+}
+
+TEST(NavigationMeshTests, GetClosestVertexWhenEmpty)
+{
+    NavigationMesh nav;
+    Vector3<float> p{5.f,5.f,5.f};
+    auto res = nav.get_closest_vertex(p);
+    EXPECT_FALSE(res.has_value());
+}