diff --git a/Bigfoot/Tests/Engine/Asset/AssetContainer.cpp b/Bigfoot/Tests/Engine/Asset/AssetContainer.cpp
index d63e076..9a1e1d5 100644
--- a/Bigfoot/Tests/Engine/Asset/AssetContainer.cpp
+++ b/Bigfoot/Tests/Engine/Asset/AssetContainer.cpp
@@ -168,6 +168,20 @@ TEST_F(AssetContainerFixture, Insert_ShouldReturnAHandleWithTheInsertedAsset)
 
 /****************************************************************************************/
 
+TEST_F(AssetContainerFixture, Insert_ShouldReuseTheExistingHandleWhenInsertingAnAssetWithAnAlreadyExistingUUID)
+{
+    ContainerHandle* const firstHandle = m_containerA.Insert();
+    const AssetBase* const firstAsset = firstHandle->GetAsset();
+    const eastl::vector<std::byte> packed = firstAsset->Pack();
+
+    ContainerHandle* const secondHandle = m_containerA.Insert(packed);
+
+    EXPECT_EQ(secondHandle, firstHandle);
+    EXPECT_EQ(secondHandle->GetAsset(), firstAsset);
+}
+
+/****************************************************************************************/
+
 TEST_F(AssetContainerFixture, Remove_ShouldRemoveTheAsset)
 {
     const ContainerHandle* handle = m_containerA.Insert();
diff --git a/Bigfoot/Tests/Engine/SerializationManager/SerializationManager.cpp b/Bigfoot/Tests/Engine/SerializationManager/SerializationManager.cpp
index 570605e..2335f68 100644
--- a/Bigfoot/Tests/Engine/SerializationManager/SerializationManager.cpp
+++ b/Bigfoot/Tests/Engine/SerializationManager/SerializationManager.cpp
@@ -91,7 +91,13 @@ class SerializationManagerFixture: public ::testing::Test
         multiRootB.GetAsset().ref_a = HardReference<AssetA> {m_sharedChildUUID};
         m_multiRootBUUID = multiRootB.GetHeader().uuid;
 
-        Populate({&leaf, &middle, &root, &cycleX, &cycleY, &sharedChild, &multiRootA, &multiRootB});
+        // missingRef --> unsavedUUID (never persisted to the data accessor)
+        AssetB missingRef;
+        missingRef.SetName("missingRef");
+        missingRef.GetAsset().ref_a = HardReference<AssetA> {m_unsavedUUID};
+        m_missingRefUUID = missingRef.GetHeader().uuid;
+
+        Populate({&leaf, &middle, &root, &cycleX, &cycleY, &sharedChild, &multiRootA, &multiRootB, &missingRef});
 
         m_leafFlatbuffer = leaf.Pack();
         m_middleFlatbuffer = middle.Pack();
@@ -99,6 +105,7 @@ class SerializationManagerFixture: public ::testing::Test
         m_sharedChildFlatbuffer = sharedChild.Pack();
         m_multiRootAFlatbuffer = multiRootA.Pack();
         m_multiRootBFlatbuffer = multiRootB.Pack();
+        m_missingRefFlatbuffer = missingRef.Pack();
     }
 
     void TearDown() override
@@ -200,6 +207,11 @@ class SerializationManagerFixture: public ::testing::Test
     UUID m_multiRootBUUID;
     eastl::vector<std::byte> m_multiRootBFlatbuffer;
 
+    // HardReferences an asset that is never saved to the data accessor
+    const UUID m_unsavedUUID;
+    UUID m_missingRefUUID;
+    eastl::vector<std::byte> m_missingRefFlatbuffer;
+
 #ifdef BIGFOOT_TOOLMODE
     eastl::optional<BigFile> m_bigFile;
 #elif defined BIGFOOT_GAME
@@ -278,6 +290,37 @@ TEST_F(SerializationManagerFixture, LoadAsset_ShouldNotReloadAnAssetThatIsAlread
 
 /****************************************************************************************/
 
+TEST_F(SerializationManagerFixture, LoadAssets_ShouldNotFailWhenTheSameRootIsPassedTwice)
+{
+    const HardReference<AssetA> leafRef {m_leafUUID};
+    ASSERT_EQ(leafRef.Get(), nullptr);
+
+    const eastl::array<UUID, 2> roots {m_leafUUID, m_leafUUID};
+    SerializationManager::LoadAssets(roots);
+
+    ASSERT_NE(leafRef.Get(), nullptr);
+    EXPECT_EQ(leafRef.Get()->Pack(), m_leafFlatbuffer);
+}
+
+/****************************************************************************************/
+
+TEST_F(SerializationManagerFixture, LoadAsset_ShouldSkipHardReferencesThatCouldNotBeFound)
+{
+    const HardReference<AssetB> missingRefRef {m_missingRefUUID};
+    const HardReference<AssetA> unsavedRef {m_unsavedUUID};
+
+    ASSERT_EQ(missingRefRef.Get(), nullptr);
+    ASSERT_EQ(unsavedRef.Get(), nullptr);
+
+    SerializationManager::LoadAsset(m_missingRefUUID);
+
+    ASSERT_NE(missingRefRef.Get(), nullptr);
+    EXPECT_EQ(missingRefRef.Get()->Pack(), m_missingRefFlatbuffer);
+    EXPECT_EQ(unsavedRef.Get(), nullptr);
+}
+
+/****************************************************************************************/
+
 TEST_F(SerializationManagerFixture, LoadAssets_ShouldLoadEveryRootAndMergeSharedHardReferences)
 {
     const HardReference<AssetA> sharedChildRef {m_sharedChildUUID};
diff --git a/Bigfoot/Tests/System/Time/Time.cpp b/Bigfoot/Tests/System/Time/Time.cpp
index a03d462..77b6422 100644
--- a/Bigfoot/Tests/System/Time/Time.cpp
+++ b/Bigfoot/Tests/System/Time/Time.cpp
@@ -16,10 +16,21 @@ class TimeFixture: public ::testing::Test
 {
   public:
     Time m_time {1'767'643'746'680'609};
+    Time m_earlierTime {1'767'643'746'680'608};
 };
 
 /****************************************************************************************/
 
+TEST_F(TimeFixture, ComparisonOperators_ShouldOrderTimesByEpoch)
+{
+    EXPECT_LT(m_earlierTime, m_time);
+    EXPECT_LE(m_earlierTime, m_time);
+    EXPECT_GT(m_time, m_earlierTime);
+    EXPECT_GE(m_time, m_earlierTime);
+}
+
+/****************************************************************************************/
+
 TEST_F(TimeFixture, GetYear_ShouldReturnTheYear)
 {
     EXPECT_EQ(m_time.GetYear(), 2026);
diff --git a/Bigfoot/Tests/System/UUID/UUID.cpp b/Bigfoot/Tests/System/UUID/UUID.cpp
index 6d116e8..c5fbd17 100644
--- a/Bigfoot/Tests/System/UUID/UUID.cpp
+++ b/Bigfoot/Tests/System/UUID/UUID.cpp
@@ -173,6 +173,13 @@ TEST_F(UUIDFixture, GeneratingFiveMillionUniqueID)
 
 /****************************************************************************************/
 
+TEST_F(UUIDFixture, LessThanOperator_ShouldOrderTwoDifferentIDsConsistently)
+{
+    EXPECT_LT(UUID::NULL_UUID, m_b);
+}
+
+/****************************************************************************************/
+
 TEST_F(UUIDFixture, ToBytes_ShouldGiveBackTheRawDataOfTheID)
 {
     std::span<const std::byte, UUID::UUID_BYTE_SIZE> idBytes = m_d.ToBytes();
diff --git a/Bigfoot/Tests/Utils/Log/Log.cpp b/Bigfoot/Tests/Utils/Log/Log.cpp
index 7bfedeb..77df6c4 100644
--- a/Bigfoot/Tests/Utils/Log/Log.cpp
+++ b/Bigfoot/Tests/Utils/Log/Log.cpp
@@ -88,8 +88,17 @@ TEST_F(LogFixture, ChangeLoggerLogLevel_ShouldChangeTheLoggerLogLevel)
 
     const quill::Logger* logger = Singleton<Log>::GetInstance().RegisterLogger(UTILSTESTS_LOGGER);
 
-    Singleton<Log>::GetInstance().ChangeLoggerLogLevel(UTILSTESTS_LOGGER, Flat::LogLevel::Critical);
-    EXPECT_EQ(QuillLogLevelToLogLevel(logger->get_log_level()), Flat::LogLevel::Critical);
+    for (const Flat::LogLevel level: {Flat::LogLevel::Debug,
+                                      Flat::LogLevel::Trace,
+                                      Flat::LogLevel::Info,
+                                      Flat::LogLevel::Warn,
+                                      Flat::LogLevel::Error,
+                                      Flat::LogLevel::Critical})
+    {
+        Singleton<Log>::GetInstance().ChangeLoggerLogLevel(UTILSTESTS_LOGGER, level);
+        EXPECT_EQ(QuillLogLevelToLogLevel(logger->get_log_level()), level);
+    }
+
     Singleton<Log>::GetInstance().ChangeLoggerLogLevel(UTILSTESTS_LOGGER, previous);
     EXPECT_EQ(QuillLogLevelToLogLevel(logger->get_log_level()), previous);
 }