diff --git a/Bigfoot/Sources/Utils/Include/Utils/Version.hpp b/Bigfoot/Sources/Utils/Include/Utils/Version.hpp
index 34b2043..bae34fe 100644
--- a/Bigfoot/Sources/Utils/Include/Utils/Version.hpp
+++ b/Bigfoot/Sources/Utils/Include/Utils/Version.hpp
@@ -114,7 +114,6 @@ class Version
 
 /****************************************************************************************/
 
-#if defined BIGFOOT_NOT_OPTIMIZED
 template<>
 struct fmt::formatter<Bigfoot::Version>
 {
@@ -131,4 +130,3 @@ struct fmt::formatter<Bigfoot::Version>
     }
 };
 #endif
-#endif
diff --git a/Bigfoot/Tests/Engine/Asset/AssetTypeID.cpp b/Bigfoot/Tests/Engine/Asset/AssetTypeID.cpp
new file mode 100644
index 0000000..97c5fa9
--- /dev/null
+++ b/Bigfoot/Tests/Engine/Asset/AssetTypeID.cpp
@@ -0,0 +1,34 @@
+/*********************************************************************
+ * \file   AssetTypeID.cpp
+ *
+ * \author Romain BOULLARD
+ * \date   August 2026
+ *********************************************************************/
+#include <Engine/Asset/AssetTypeID.hpp>
+
+#include <Engine/Asset/AssetTypeID_generated.hpp>
+
+#include <gtest/gtest.h>
+
+#include <limits>
+
+namespace Bigfoot
+{
+TEST(AssetTypeID, Pack_ShouldGiveAFlatAssetTypeIDWithTheSameValue)
+{
+    constexpr AssetTypeID assetTypeID = 42;
+
+    const Flat::Bigfoot::AssetTypeID flatAssetTypeID = flatbuffers::Pack(assetTypeID);
+    EXPECT_EQ(flatAssetTypeID.value(), assetTypeID);
+}
+
+/****************************************************************************************/
+
+TEST(AssetTypeID, UnPack_ShouldGiveBackTheOriginalValue)
+{
+    constexpr AssetTypeID assetTypeID = 42;
+
+    const Flat::Bigfoot::AssetTypeID flatAssetTypeID = flatbuffers::Pack(assetTypeID);
+    EXPECT_EQ(flatbuffers::UnPack(flatAssetTypeID), assetTypeID);
+}
+}   // namespace Bigfoot
diff --git a/Bigfoot/Tests/System/Time/Time.cpp b/Bigfoot/Tests/System/Time/Time.cpp
index ce300d2..ac046ee 100644
--- a/Bigfoot/Tests/System/Time/Time.cpp
+++ b/Bigfoot/Tests/System/Time/Time.cpp
@@ -6,6 +6,8 @@
  *********************************************************************/
 #include <System/Time/Time.hpp>
 
+#include <System/Time/Time_generated.hpp>
+
 #include <gtest/gtest.h>
 
 namespace Bigfoot
@@ -64,4 +66,20 @@ TEST_F(TimeFixture, GetMicrosecond_ShouldReturnTheMicrosecond)
 {
     EXPECT_EQ(m_time.GetMicrosecond(), 680'609);
 }
+
+/****************************************************************************************/
+
+TEST_F(TimeFixture, Pack_ShouldGiveAFlatTimeWithTheSameEpoch)
+{
+    const Flat::Bigfoot::Time flatTime = flatbuffers::Pack(m_time);
+    EXPECT_EQ(flatTime.epoch(), m_time.GetEpoch());
+}
+
+/****************************************************************************************/
+
+TEST_F(TimeFixture, UnPack_ShouldGiveBackTheOriginalTime)
+{
+    const Flat::Bigfoot::Time flatTime = flatbuffers::Pack(m_time);
+    EXPECT_EQ(flatbuffers::UnPack(flatTime), m_time);
+}
 }   // namespace Bigfoot
diff --git a/Bigfoot/Tests/System/UUID/UUID.cpp b/Bigfoot/Tests/System/UUID/UUID.cpp
index debfccf..67bf71a 100644
--- a/Bigfoot/Tests/System/UUID/UUID.cpp
+++ b/Bigfoot/Tests/System/UUID/UUID.cpp
@@ -6,6 +6,8 @@
  *********************************************************************/
 #include <System/UUID/UUID.hpp>
 
+#include <System/UUID/UUID_generated.hpp>
+
 #include <ankerl/unordered_dense.h>
 #include <gtest/gtest.h>
 
@@ -178,4 +180,32 @@ TEST_F(UUIDFixture, ToBytes_ShouldGiveBackTheRawDataOfTheID)
         EXPECT_EQ(d[i], raw[i]);
     }
 }
+
+/****************************************************************************************/
+
+TEST_F(UUIDFixture, Pack_ShouldGiveAFlatUUIDWithTheSameRawBytes)
+{
+    const Flat::Bigfoot::UUID flatUUID = flatbuffers::Pack(m_d);
+
+    for (std::uint32_t i = 0; i < UUID::UUID_BYTE_SIZE; ++i)
+    {
+        EXPECT_EQ(std::byte {(*flatUUID.bytes())[i]}, m_raw[i]);
+    }
+}
+
+/****************************************************************************************/
+
+TEST_F(UUIDFixture, UnPack_ShouldGiveBackTheOriginalUUID)
+{
+    const Flat::Bigfoot::UUID flatUUID = flatbuffers::Pack(m_d);
+    EXPECT_EQ(flatbuffers::UnPack(flatUUID), m_d);
+}
+
+/****************************************************************************************/
+
+TEST_F(UUIDFixture, FormatsUUID)
+{
+    EXPECT_EQ(fmt::format("{}", m_b), m_b.ToString());
+    EXPECT_EQ(fmt::format("{}", UUID::NULL_UUID), "00000000-0000-0000-0000-000000000000");
+}
 }   // namespace Bigfoot
diff --git a/Bigfoot/Tests/Utils/Version.cpp b/Bigfoot/Tests/Utils/Version.cpp
index bba4a02..7c9998b 100644
--- a/Bigfoot/Tests/Utils/Version.cpp
+++ b/Bigfoot/Tests/Utils/Version.cpp
@@ -70,4 +70,12 @@ TEST_F(VersionFixture, Comparisons)
     EXPECT_EQ(other, other);
     EXPECT_NE(other, m_detailed);
 }
+
+/****************************************************************************************/
+
+TEST_F(VersionFixture, FormatsVersion)
+{
+    EXPECT_EQ(fmt::format("{}", m_detailed), "1.2.3");
+    EXPECT_EQ(fmt::format("{}", m_combined), "1.2.3");
+}
 }   // namespace Bigfoot