mockfs
v0.1.5
Published
Mocking FS module implementation for testing purpouses
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mockfs
MockFS - Mocking FS module implementation for testing purpouses.
Basic idea is to declare file system contents via JSON spec, mount it, and use through real fs.*
functions like an ordinary one.
/**
* /
* file-buffer
* file-base64
* file-string
* file-alt
* dir/
* file-in-dir
*/
var fs = require('fs'),
MockFS = require('mockfs'),
spec, mfs, fd;
spec = {
time: 'Tue May 07 2013 17:09:57 GMT+0400' // global default time for any FS item, optional
ctime: new Date(), // creation time default, optional
/*atime: ..., // atime and ctime is not set
mtime: ...,*/ // value is taken from FS defaults (time)
items: {
'file-buffer': new Buffer('qwerty'), // specify content as Buffer
'file-base64': new Buffer('cXdlcnR5', 'base64'), // buffer with encoding
'file-string': 'qwerty', // or as string
'file-alt': { // alternative syntax
uid: 'johndoe', // owner user, as login name or id
gid: 300, // owner group
mode: 0766, // access mode
atime: new Date(), // Date instance
mtime: 1000255364, // timestamp
ctime: "-500" // number with a sign (+/-) - delta from fs default value
content: 'asobject' // file content
},
'dir': { // directory - always an object with items property (which is object too)
atime: 'Tue May 07 2013 17:09:57 GMT+0400' // Date as string
mtime: "+500", // stats, uid, gid, mode - on directories too
/*ctime*/ // ctime is not set, value taken from FS defaults
items: { // directory contents
'file-in-dir': 'inside directory'
}
}
};
mfs = new MockFS(spec);
mfs.mount('/mnt/mock');
fs.existsSync('/mnt/mock/file-buffer'); // true
fs.readFileSync('/mnt/mock/file-string').toString(); // "qwerty"
fs.readFile('/mnt/mock/dir/file-in-dir', function(e, r){
Buffer.isBuffer(r); // true
r.toString(); // "inside directory"
});
// file descriptors is also works
fs.open('/mnt/mock/file-base64', 'r', function(e, fd){
if(fd) {
var buf = new Buffer(100);
fs.read(fd, buf, 0, 100, null, function(e, bytesRead){
console.log(bytesRead); // 6
console.log(buf.toString('utf8', 0, bytesRead)); // qwerty
fs.closeSync(fd);
});
}
});
mfs.umount('/mnt/mock');
fs.existsSync('/mnt/mock/file-buffer'); // false
Implemented by wrapping bundled fs
module's basic functions (file descriptors handling, stat, rename/delete files/directories).
So, functions as createReadStream
, appendFileSync
and so are supported "out of the box" without any wrapping.
Currently, NodeJS v0.8+ is supported.
TODO
- Support legacy interfaces
- Access rights check (read/write/search permissions)
- *chown(Sync), *chmod(Sync) functions
- Links support
- (un)watch(File) support
mirror
utility to create MockFS specs from real file systems- Integrate with some date parsing library for convinient atime/ctime/mtime specification
Roadmap
v0.2
- Access rights check (read/write/search permissions)
- *chown(Sync), *chmod(Sync) functions
v0.3
- Links support
- (un)watch(File) support
v1.0
- Support legacy interfaces
- Pass NodeJS test suite