.

src/StaticSettingsTests/VirtualizedRunHelperTests.cs

@@ -95,6 +95,20 @@ class TestEnv(Func<string, bool> exists, string currentDirectory, char directory
     {
         public string CurrentDirectory { get; } = currentDirectory;
         public char DirectorySeparatorChar { get; } = directorySeparatorChar;
+
+        public char AltDirectorySeparatorChar
+        {
+            get
+            {
+                if (DirectorySeparatorChar == '/')
+                {
+                    return '\\';
+                }
+
+                return '/';
+            }
+        }
+
         public bool PathExists(string path) => exists(path);
 
         // Make sure Path.Combine behaves as on Unix, even when executed on Windows

src/Verify/IEnvironment.cs

@@ -2,6 +2,7 @@ interface IEnvironment
 {
     string CurrentDirectory { get; }
     char DirectorySeparatorChar { get; }
+    char AltDirectorySeparatorChar { get; }
     bool PathExists(string path);
     string CombinePaths(string path1, string path2);
 }

src/Verify/PhysicalEnvironment.cs

@@ -8,6 +8,7 @@ class PhysicalEnvironment : IEnvironment
 
     public string CurrentDirectory => Environment.CurrentDirectory;
     public char DirectorySeparatorChar => Path.DirectorySeparatorChar;
+    public char AltDirectorySeparatorChar => Path.AltDirectorySeparatorChar;
     public bool PathExists(string path) => File.Exists(path) || Directory.Exists(path);
     public string CombinePaths(string path1, string path2) => Path.Combine(path1, path2);
 }

src/Verify/VirtualizedRunHelper.cs

@@ -155,7 +155,8 @@ static bool TryFindByCrossSectionOfBuildRunPath(
             return false;
         }
 
-        var currentDirRelativeToAppRoot = Env.CurrentDirectory.TrimStart(separators);
+        var currentDirectory = Env.CurrentDirectory;
+        var currentDirRelativeToAppRoot = currentDirectory.TrimStart(separators);
         //remove the drive info from the code root
         var mappedCodeBaseRootRelative = originalCodeBaseRoot.Replace('\\', '/');
         while (TryRemoveDirFromStartOfPath(ref currentDirRelativeToAppRoot))
@@ -167,7 +168,7 @@ static bool TryFindByCrossSectionOfBuildRunPath(
                     continue;
                 }
 
-                mappedCodeBaseRootAbsolute = Env.CurrentDirectory[..^currentDirRelativeToAppRoot.Length];
+                mappedCodeBaseRootAbsolute = currentDirectory[..^currentDirRelativeToAppRoot.Length];
 
                 // the start of paths to be mapped
 
@@ -198,7 +199,7 @@ static string GetBuildTimePathRelative(string? originalCodeBaseRoot, string buil
         {
             buildTimePathRelative = buildTimePathRelative[originalCodeBaseRoot.Length..];
             buildTimePathRelative = buildTimePathRelative.TrimStart(separators);
-            if (buildTimePathRelative.Trim(separators) == string.Empty)
+            if (buildTimePathRelative == string.Empty)
             {
                 buildTimePathRelative = buildTimePath;
             }
@@ -215,7 +216,7 @@ static string GetBuildTimePathRelative(string? originalCodeBaseRoot, string buil
 
     static bool AppearsBuiltOnCurrentPlatform(string buildTimePath) =>
         buildTimePath.Contains(Env.DirectorySeparatorChar) &&
-        !buildTimePath.Contains(separators.First(_ => _ != Env.DirectorySeparatorChar));
+        !buildTimePath.Contains(Env.AltDirectorySeparatorChar);
 
     static bool TryRemoveDirFromStartOfPath(ref string path)
     {