test: review ident tests

test/entt/core/ident.cpp

@@ -1,31 +1,30 @@
 #include <type_traits>
 #include <gtest/gtest.h>
+#include <common/boxed_type.h>
+#include <common/empty.h>
 #include <entt/core/ident.hpp>
 
-struct a_type {};
-struct another_type {};
-
 TEST(Ident, Uniqueness) {
-    using id = entt::ident<a_type, another_type>;
-    constexpr a_type an_instance;
-    constexpr another_type another_instance;
+    using id = entt::ident<test::empty, test::boxed_int>;
+    constexpr test::empty instance;
+    constexpr test::boxed_int other;
 
-    ASSERT_NE(id::value<a_type>, id::value<another_type>);
-    ASSERT_EQ(id::value<a_type>, id::value<decltype(an_instance)>);
-    ASSERT_NE(id::value<a_type>, id::value<decltype(another_instance)>);
-    ASSERT_EQ(id::value<a_type>, id::value<a_type>);
-    ASSERT_EQ(id::value<another_type>, id::value<another_type>);
+    ASSERT_NE(id::value<test::empty>, id::value<test::boxed_int>);
+    ASSERT_EQ(id::value<test::empty>, id::value<decltype(instance)>);
+    ASSERT_NE(id::value<test::empty>, id::value<decltype(other)>);
+    ASSERT_EQ(id::value<test::empty>, id::value<test::empty>);
+    ASSERT_EQ(id::value<test::boxed_int>, id::value<test::boxed_int>);
 
     // test uses in constant expressions
-    switch(id::value<another_type>) {
-    case id::value<a_type>:
+    switch(id::value<test::boxed_int>) {
+    case id::value<test::empty>:
         FAIL();
-    case id::value<another_type>:
+    case id::value<test::boxed_int>:
         SUCCEED();
     }
 }
 
 TEST(Identifier, SingleType) {
-    using id = entt::ident<a_type>;
-    [[maybe_unused]] const std::integral_constant<id::value_type, id::value<a_type>> ic;
+    using id = entt::ident<test::empty>;
+    [[maybe_unused]] const std::integral_constant<id::value_type, id::value<test::empty>> ic;
 }