Fix statistics tests for immediate exception behavior

Updated EnumerateDirectories statistics tests to create directories first,
ensuring they test successful method calls rather than exception paths.
The fix maintains proper statistics tracking while enabling immediate
exception throwing for missing directories.

Co-authored-by: vbreuss <3438234+vbreuss@users.noreply.github.com>

Author: Copilot

Tests/Testably.Abstractions.Testing.Tests/Statistics/FileSystem/DirectoryInfoStatisticsTests.cs

@@ -80,6 +80,7 @@ await That(sut.Statistics.DirectoryInfo["foo"])
 	public async Task Method_EnumerateDirectories_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 
 		sut.DirectoryInfo.New("foo").EnumerateDirectories();
 
@@ -93,6 +94,7 @@ await That(sut.Statistics.DirectoryInfo["foo"])
 	public async Task Method_EnumerateDirectories_String_EnumerationOptions_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string searchPattern = "foo";
 		EnumerationOptions enumerationOptions = new();
 
@@ -109,6 +111,7 @@ await That(sut.Statistics.DirectoryInfo["foo"])
 	public async Task Method_EnumerateDirectories_String_SearchOption_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string searchPattern = "foo";
 		SearchOption searchOption = SearchOption.AllDirectories;
 
@@ -124,6 +127,7 @@ await That(sut.Statistics.DirectoryInfo["foo"])
 	public async Task Method_EnumerateDirectories_String_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string searchPattern = "foo";
 
 		sut.DirectoryInfo.New("foo").EnumerateDirectories(searchPattern);

Tests/Testably.Abstractions.Testing.Tests/Statistics/FileSystem/DirectoryStatisticsTests.cs

@@ -103,6 +103,7 @@ await That(sut.Statistics.Directory).OnlyContainsMethodCall(nameof(IDirectory.De
 	public async Task Method_EnumerateDirectories_String_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string path = "foo";
 
 		sut.Directory.EnumerateDirectories(path);
@@ -118,6 +119,7 @@ await That(sut.Statistics.Directory).OnlyContainsMethodCall(
 	public async Task Method_EnumerateDirectories_String_String_EnumerationOptions_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string path = "foo";
 		string searchPattern = "foo";
 		EnumerationOptions enumerationOptions = new();
@@ -135,6 +137,7 @@ await That(sut.Statistics.Directory).OnlyContainsMethodCall(
 	public async Task Method_EnumerateDirectories_String_String_SearchOption_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string path = "foo";
 		string searchPattern = "foo";
 		SearchOption searchOption = SearchOption.AllDirectories;
@@ -151,6 +154,7 @@ await That(sut.Statistics.Directory).OnlyContainsMethodCall(
 	public async Task Method_EnumerateDirectories_String_String_ShouldRegisterCall()
 	{
 		MockFileSystem sut = new();
+		sut.Initialize().WithSubdirectory("foo");
 		string path = "foo";
 		string searchPattern = "foo";