diff --git a/README.md b/README.md
index 81de3f0..e823362 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ This is a tiny wrapper around the [Symfony filesystem]. It provides:
 - A class `NativeFileSystem` implementing `FileSystem`.
 - A readonly implementation `ReadOnlyFileSystem`. It can be used to either do no write operation or to bailout on write
   operations. Note that for a better read/write API, a library such as [Flysystem] is recommended.
+- A `FakeFileSystem` implementation.
 - A `FS` static class for when you are not interested of using dependency injection for your filesystem layer or for
   usage within tests.
 - A `SplFileInfoFactory` utility to create a Symfony Finder `SplFileInfo` instance without using `Finder`.
diff --git a/src/FakeFileSystem.php b/src/FakeFileSystem.php
new file mode 100644
index 0000000..9c5907d
--- /dev/null
+++ b/src/FakeFileSystem.php
@@ -0,0 +1,192 @@
+<?php
+
+/*
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2022, Théo FIDRY <theo.fidry@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+namespace Fidry\FileSystem;
+
+use DomainException;
+use Symfony\Component\Finder\Finder;
+use Traversable;
+
+final class FakeFileSystem implements FileSystem
+{
+    public function isRelativePath(string $path): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function escapePath(string $path): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function dumpFile(string $filename, $content = ''): void
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function getFileContents(string $file): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function makeTmpDir(string $namespace, string $className): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function getNamespacedTmpDir(string $namespace): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function isReadable(string $filename): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function isReadableFile(string $filename): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function isReadableDirectory(string $filename): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function createFinder(): Finder
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function copy(string $originFile, string $targetFile, bool $overwriteNewerFiles = false): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function mkdir(iterable|string $dirs, int $mode = 0o777): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function exists(iterable|string $files): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function touch(iterable|string $files, ?int $time = null, ?int $atime = null): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function remove(iterable|string $files): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function chmod(
+        iterable|string $files,
+        int $mode,
+        int $umask = 0o000,
+        bool $recursive = false
+    ): never {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function chown(iterable|string $files, int|string $user, bool $recursive = false): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function chgrp(iterable|string $files, int|string $group, bool $recursive = false): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function rename(string $origin, string $target, bool $overwrite = false): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function symlink(string $originDir, string $targetDir, bool $copyOnWindows = false): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function hardlink(string $originFile, iterable|string $targetFiles): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function readlink(string $path, bool $canonicalize = false): ?string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function makePathRelative(string $endPath, string $startPath): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function mirror(
+        string $originDir,
+        string $targetDir,
+        ?Traversable $iterator = null,
+        array $options = []
+    ): never {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function isAbsolutePath(string $file): bool
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function tempnam(string $dir, string $prefix, string $suffix = ''): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function appendToFile(string $filename, $content): never
+    {
+        throw new DomainException('Unexpected call.');
+    }
+
+    public function readFile(string $filename): string
+    {
+        throw new DomainException('Unexpected call.');
+    }
+}