Normalizes paths when writing exceptions to the console for tests.

The verified output for Should_Write_GenericException was outputting ProjectDirectory}Data\Exceptions.cs on my Windows machine, but the Verified version wasProjectDirectory}Data/Exceptions.cs

Wasn't causing a build issue because we run those on Ubuntu, but locally it was giving me an error.

Author: phil-scott-78

src/Spectre.Console.Testing/Extensions/TestConsoleExtensions.Exceptions.cs

@@ -0,0 +1,41 @@
+namespace Spectre.Console.Tests;
+
+public static class TestConsoleExtensions
+{
+    private static readonly Regex _lineNumberRegex = new Regex(":\\d+", RegexOptions.Singleline);
+    private static readonly Regex _filenameRegex = new Regex("\\sin\\s.*cs:nn", RegexOptions.Multiline);
+    private static readonly Regex _pathSeparatorRegex = new Regex(@"[/\\]+");
+
+    public static string WriteNormalizedException(this TestConsole console, Exception ex, ExceptionFormats formats = ExceptionFormats.Default)
+    {
+        if (!string.IsNullOrWhiteSpace(console.Output))
+        {
+            throw new InvalidOperationException("Output buffer is not empty.");
+        }
+
+        console.WriteException(ex, formats);
+        return string.Join("\n", NormalizeStackTrace(console.Output)
+            .NormalizeLineEndings()
+            .Split(new char[] { '\n' })
+            .Select(line => line.TrimEnd()));
+    }
+
+    public static string NormalizeStackTrace(string text)
+    {
+        // First normalize line numbers
+        text = _lineNumberRegex.Replace(text, ":nn");
+
+        // Then normalize paths and filenames
+        text = _filenameRegex.Replace(text, match =>
+        {
+            var value = match.Value;
+            var index = value.LastIndexOfAny(new[] { '\\', '/' });
+            var filename = value.Substring(index + 1, value.Length - index - 1);
+
+            return $" in /xyz/{filename}";
+        });
+
+        // Finally normalize any remaining path separators
+        return _pathSeparatorRegex.Replace(text, "/");
+    }
+}