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Allow to use custom mocks for parts of the file system

state: needs discussionIssues that need further discussionIssues that need further discussion

type: enhancementIssues that propose new functionalityIssues that propose new functionality

Status: Open.

#1465 In TestableIO/System.IO.Abstractions;

· PaulMaget opened on Apr 19, 2026

MockFileSystem.Directory.CreateDirectory should NOT throw IOException if conflicting file exists

flag: good-first-issueIssues that are good for first time contributorsIssues that are good for first time contributors

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#1386 In TestableIO/System.IO.Abstractions;

· EnomisG opened on Dec 3, 2025

[Feature Request] Partially virtual/mockable filesystem

state: needs discussionIssues that need further discussionIssues that need further discussion

type: enhancementIssues that propose new functionalityIssues that propose new functionality

Status: Open.

#1346 In TestableIO/System.IO.Abstractions;

· MeltyPlayer opened on Oct 2, 2025

dotnet list package failes when TestableIO.System.IO.Abstractions.TestingHelpers is added as package

state: needs discussionIssues that need further discussionIssues that need further discussion

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#1165 In TestableIO/System.IO.Abstractions;

· Dave-Senn opened on Nov 13, 2024

The mock FileStream class does not handle shared file contents correctly.

state: ready to pickIssues that are ready for being worked onIssues that are ready for being worked on

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#1131 In TestableIO/System.IO.Abstractions;

· BillArmstrong opened on Jul 11, 2024

Microsoft Fakes does not generate Fakes namespace for System.IO.Abstractions interfaces

area: metaIssues around high-level/organizational topicsIssues around high-level/organizational topics

state: needs discussionIssues that need further discussionIssues that need further discussion

type: questionIssues that ask for support / guidanceIssues that ask for support / guidance

Status: Open.

#1073 In TestableIO/System.IO.Abstractions;

· RoyRosenberg opened on Dec 29, 2023

PathVerifier fails on whitespace filename under Linux and .NET Core

area: testinghelpersIssues that address the testing helpersIssues that address the testing helpers

state: ready to pickIssues that are ready for being worked onIssues that are ready for being worked on

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#1070 In TestableIO/System.IO.Abstractions;

· AnakinRaW opened on Dec 25, 2023

MockPath.GetFullPath does not match windows behavior.

area: testinghelpersIssues that address the testing helpersIssues that address the testing helpers

state: ready to pickIssues that are ready for being worked onIssues that are ready for being worked on

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#1044 In TestableIO/System.IO.Abstractions;

· AnakinRaW opened on Oct 8, 2023

GetDrives on mac returns a DriveInfo.Name "/:\\" -- the colon and backslashes is not expected

area: testinghelpersIssues that address the testing helpersIssues that address the testing helpers

state: ready to pickIssues that are ready for being worked onIssues that are ready for being worked on

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#927 In TestableIO/System.IO.Abstractions;

· mikeatdjp opened on Dec 22, 2022

MockFileSystem.AddFilesFromEmbeddedNamespace() method throws ArgumentNullException

area: testinghelpersIssues that address the testing helpersIssues that address the testing helpers

state: waiting for feedbackIssues that are waiting for feedbackIssues that are waiting for feedback

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#921 In TestableIO/System.IO.Abstractions;

· ristogod opened on Dec 7, 2022

MockFileSystem.AddFile() does not update MockFileInfo.Exists

state: needs discussionIssues that need further discussionIssues that need further discussion

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#899 In TestableIO/System.IO.Abstractions;

· rcdailey opened on Oct 25, 2022

MockDirectory.EnumerateFiles search pattern behaves differently from Directory.EnumerateFiles in .NET 5+

area: testinghelpersIssues that address the testing helpersIssues that address the testing helpers

state: ready to pickIssues that are ready for being worked onIssues that are ready for being worked on

type: bugIssues that describe misbehaving functionalityIssues that describe misbehaving functionality

Status: Open.

#895 In TestableIO/System.IO.Abstractions;

· Gav-Brown opened on Oct 13, 2022