fix tests on linux

Author: AnakinRaW

src/PetroglyphTools/PG.StarWarsGame.Engine.Test/EngineRepositoryTestBase.cs

@@ -334,4 +334,13 @@ private static string JitterSeparators(string path, Random random)
         }
         return new string(chars);
     }
+
+    /// <summary>
+    /// Returns the last segment of an engine path, treating both '/' and '\' as separators.
+    /// </summary>
+    // Engine paths always use '\'; System.IO.Path.GetFileName only splits on '\' on Windows.
+    protected static string EngineFileName(string path)
+    {
+        return path.Substring(path.LastIndexOfAny(['/', '\\']) + 1);
+    }
 }

src/PetroglyphTools/PG.StarWarsGame.Engine.Test/IO/Foc/FocGameRepositoryTests.Initialization.cs

@@ -1,4 +1,3 @@
-using System.IO;
 using System.Linq;
 using PG.StarWarsGame.Engine.ErrorReporting;
 using Xunit;
@@ -124,7 +123,7 @@ public void ErrorReporter_MissingEawPatches_AssertsFileNotFound_WhenFallbackConf
 
         var names = reporter.Asserts
             .Where(a => a.Kind == EngineAssertKind.FileNotFound)
-            .Select(a => Path.GetFileName(a.Value))
+            .Select(a => EngineFileName(a.Value))
             .ToList();
         // 6 missing: Patch / Patch2 / 64Patch in both the fallback and the FoC dir.
         Assert.Equal(2, names.Count(v => v == "Patch.meg"));

src/PetroglyphTools/PG.StarWarsGame.Engine.Test/IO/GameRepositoryTests.Initialization.cs

@@ -1,4 +1,3 @@
-using System.IO;
 using System.Linq;
 using PG.StarWarsGame.Engine.ErrorReporting;
 using Xunit;
@@ -141,7 +140,7 @@ public void ErrorReporter_MissingPatchMegs_AssertsFileNotFound()
 
         var fileNotFoundNames = reporter.Asserts
             .Where(a => a.Kind == EngineAssertKind.FileNotFound)
-            .Select(a => Path.GetFileName(a.Value))
+            .Select(a => EngineFileName(a.Value))
             .ToList();
         Assert.Contains("Patch.meg",   fileNotFoundNames);
         Assert.Contains("Patch2.meg",  fileNotFoundNames);
@@ -165,7 +164,7 @@ public void ErrorReporter_AllPatchesPresent_NoFileNotFoundForPatches()
 
         var fileNotFoundNames = reporter.Asserts
             .Where(a => a.Kind == EngineAssertKind.FileNotFound)
-            .Select(a => Path.GetFileName(a.Value))
+            .Select(a => EngineFileName(a.Value))
             .ToList();
         Assert.DoesNotContain("Patch.meg",   fileNotFoundNames);
         Assert.DoesNotContain("Patch2.meg",  fileNotFoundNames);
@@ -189,7 +188,7 @@ public void ErrorReporter_MegaFilesXmlReferencesMissingMeg_AssertsFileNotFound()
         _ = CreateRepository(repo, reporter);
 
         Assert.Contains(reporter.Asserts, a =>
-            a.Kind == EngineAssertKind.FileNotFound && Path.GetFileName(a.Value) == "DoesNotExist.meg");
+            a.Kind == EngineAssertKind.FileNotFound && EngineFileName(a.Value) == "DoesNotExist.meg");
     }
 
     [Fact]
@@ -210,6 +209,6 @@ public void ErrorReporter_MissingSpeechMeg_DoesNotAssert()
         _ = CreateRepository(repo, reporter);
 
         Assert.DoesNotContain(reporter.Asserts, a =>
-            a.Kind == EngineAssertKind.FileNotFound && Path.GetFileName(a.Value) == "EnglishSpeech.meg");
+            a.Kind == EngineAssertKind.FileNotFound && EngineFileName(a.Value) == "EnglishSpeech.meg");
     }
 }