diff --git a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgConversionIntegrationTests.cs b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgConversionIntegrationTests.cs
index 6aa9b5c5..dadd7941 100644
--- a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgConversionIntegrationTests.cs
+++ b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgConversionIntegrationTests.cs
@@ -57,7 +57,8 @@ public void TryAutomateSvgConversion_WithValidMmFile_ShouldReturnTrueAndCreateSv
 
             // Act
             var method = typeof(FallacyMindMapDocumentConfig).GetMethod("TryAutomateSvgConversion", BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { typeof(string), typeof(string), typeof(AssetConverterConfig), typeof(bool) }, null);
-            var result = (bool)method.Invoke(_generator, new object[] { mmPath, svgPath, _config, false });
+            Assert.NotNull(method);
+            var result = (bool)method!.Invoke(_generator, new object[] { mmPath, svgPath, _config, false })!;
 
             // Assert
             Assert.True(result, "L'exécution du processus de conversion SVG doit réussir.");
diff --git a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgDisambiguationContractTests.cs b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgDisambiguationContractTests.cs
index 7f77600b..0e6ece4e 100644
--- a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgDisambiguationContractTests.cs
+++ b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgDisambiguationContractTests.cs
@@ -34,7 +34,7 @@ public class SvgDisambiguationContractTests
         private static readonly XNamespace Svg = "http://www.w3.org/2000/svg";
 
         // Minimal <g> with one <text> child — the shape CollectPossibleSvgNodes scans for.
-        private static XElement G(string text, string id = null)
+        private static XElement G(string text, string? id = null)
         {
             var g = new XElement(Svg + "g");
             if (id != null) g.SetAttributeValue("id", id);
diff --git a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgPostProcessingTests.cs b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgPostProcessingTests.cs
index 6985c44d..4640c857 100644
--- a/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgPostProcessingTests.cs
+++ b/Generation/Converters/Argumentum.AssetConverter.Tests/MindmapGeneration/SvgPostProcessingTests.cs
@@ -30,7 +30,7 @@ public async Task ProcessSvgFilesAsync_WithSimpleSvg_ShouldMatchApprovedSnapshot
             var processedSvgContent = FallacyMindMapDocumentConfig.GetSvgContent(processedSvgDocs.Values.First());
 
             // Assert
-            var snapshotDirectory = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "snapshots");
+            var snapshotDirectory = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location)!, "snapshots");
             var snapshotFile = Path.Combine(snapshotDirectory, "sample_fallacy_map.snapshot.svg");
             
             // Auto-generate snapshot if it doesn't exist (first run)