test: use shared custom_entity type

test/entt/entity/sparse_set.cpp

@@ -13,22 +13,19 @@
 #include <entt/entity/entity.hpp>
 #include <entt/entity/sparse_set.hpp>
 #include "../common/config.h"
+#include "../common/custom_entity.h"
 #include "../common/throwing_allocator.hpp"
 
-enum custom_entity : std::uint32_t {};
-
 struct custom_entity_traits {
-    using value_type = custom_entity;
-
+    using value_type = test::custom_entity;
     using entity_type = std::uint32_t;
     using version_type = std::uint16_t;
-
     static constexpr entity_type entity_mask = 0x3FFFF; // 18b
     static constexpr entity_type version_mask = 0x3FFF; // 14b
 };
 
 template<>
-struct entt::entt_traits<custom_entity>: entt::basic_entt_traits<custom_entity_traits> {
+struct entt::entt_traits<test::custom_entity>: entt::basic_entt_traits<custom_entity_traits> {
     static constexpr std::size_t page_size = ENTT_SPARSE_PAGE;
 };
 
@@ -46,7 +43,7 @@ struct SparseSet: testing::Test {
 template<typename Type>
 using SparseSetDeathTest = SparseSet<Type>;
 
-using SparseSetTypes = ::testing::Types<entt::entity, custom_entity>;
+using SparseSetTypes = ::testing::Types<entt::entity, test::custom_entity>;
 
 TYPED_TEST_SUITE(SparseSet, SparseSetTypes, );
 TYPED_TEST_SUITE(SparseSetDeathTest, SparseSetTypes, );