Import material textures with mesh assets

tests/Resources/Mesh/test_mesh.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 #include <XCEngine/Resources/Mesh/Mesh.h>
+#include <XCEngine/Resources/Material/Material.h>
 #include <XCEngine/Core/Asset/ResourceTypes.h>
 #include <XCEngine/Core/Asset/ResourceManager.h>
 
@@ -31,6 +32,11 @@ TEST(Mesh, GetSections) {
     EXPECT_EQ(mesh.GetSections().Size(), 0u);
 }
 
+TEST(Mesh, GetMaterials) {
+    Mesh mesh;
+    EXPECT_EQ(mesh.GetMaterials().Size(), 0u);
+}
+
 TEST(Mesh, SetVertexAndIndexData) {
     Mesh mesh;
 
@@ -71,6 +77,17 @@ TEST(Mesh, AddSection) {
     EXPECT_EQ(mesh.GetSections()[0].materialID, 2u);
 }
 
+TEST(Mesh, AddMaterial) {
+    Mesh mesh;
+
+    auto* material = new Material();
+    mesh.AddMaterial(material);
+
+    ASSERT_EQ(mesh.GetMaterials().Size(), 1u);
+    EXPECT_EQ(mesh.GetMaterial(0), material);
+    EXPECT_GT(mesh.GetMemorySize(), 0u);
+}
+
 TEST(Mesh, SetBounds) {
     Mesh mesh;