Struct FakeFilesystem 

pub struct FakeFilesystem { /* private fields */ }

In-memory filesystem for tests.

Files are stored as byte vectors keyed by their (absolute or relative) path. Directory entries are derived automatically from file paths. All methods that mutate state accept &self via interior mutability (RefCell) so that test helpers and trait implementations share the same borrow.

Implementations

impl FakeFilesystem

pub fn new() -> Self

pub fn set_fail_on_write(&self, path: impl Into<PathBuf>)

Cause the next write() to the given path to return an error.

pub fn set_fail_on_rename(&self, path: impl Into<PathBuf>)

Cause rename() targeting the given destination path to return an error.

pub fn set_fail_on_copy(&self, fail: bool)

Cause all copy_file() calls to return an error.

pub fn add_file(&self, path: impl Into<PathBuf>, content: impl Into<Vec<u8>>)

Insert a file with the given content, automatically registering all ancestor directories.

pub fn add_dir(&self, path: impl Into<PathBuf>)

Explicitly register a directory path.

pub fn get_file_content(&self, path: &Path) -> Option<Vec<u8>>

Return the stored content for a path, or None if absent.

pub fn file_exists(&self, path: &Path) -> bool

Return true if the path has been added as a file.

pub fn snapshot_files(&self) -> BTreeMap<PathBuf, Vec<u8>>

Return a sorted snapshot of every file currently stored in the fake filesystem.

Trait Implementations

impl Default for FakeFilesystem

fn default() -> Self

Returns the “default value” for a type.

impl Filesystem for FakeFilesystem

fn exists(&self, path: &Path) -> bool

fn is_dir(&self, path: &Path) -> bool

fn is_file(&self, path: &Path) -> bool

fn read_to_string(&self, path: &Path) -> Result<String>

fn read(&self, path: &Path) -> Result<Vec<u8>>

fn write(&self, path: &Path, contents: &str) -> Result<()>

fn write_bytes(&self, path: &Path, contents: &[u8]) -> Result<()>

fn create_dir_all(&self, path: &Path) -> Result<()>

fn copy_file(&self, src: &Path, dest: &Path) -> Result<()>

fn rename(&self, from: &Path, to: &Path) -> Result<()>

Atomically rename from to to, replacing to if it already exists.

fn remove_file(&self, path: &Path) -> Result<()>

fn remove_dir_all(&self, path: &Path) -> Result<()>

fn read_dir(&self, path: &Path) -> Result<Vec<DirEntry>>

fn canonicalize(&self, path: &Path) -> Result<PathBuf>