Justo-assert-fs NPM

An assertion library for files.

Proudly made with ♥ in Valencia, Spain, EU.

Features:

Allow to assert files.
Allow to access the file content: text, JSON and YAML.
Allow to assert directories.

Install

npm install justo-assert-fs

File assertions

To assert files, we have to use the file() function as starting point:

file(path : string)
file(dir : string, file : string)

Once created the file object, we have to use the must property to assert.

Example:

const file = require("justo-assert-fs").file;

file("/my/dir", "file.txt").must.exist()

must.exist() and must.not.exist()

Checks whether the file exists:

must.exist()
must.exist(msg : string)

must.not.exist()
must.not.exist(msg : string)

must.contain() and must.not.contain()

Checks whether the file contains a text or several texts:

must.contain(txt : string)
must.contain(txt : string, msg : string)
must.contain(txts : string[])
must.contain(txts : string[], msg : string)

must.not.contain(txt : string)
must.not.contain(txt : string, msg : string)
must.not.contain(txt : string[])
must.not.contain(txt : string[], msg : string)

must.be.equal(), must.be.eq(), must.not.be.equal() and must.not.be.eq()

Checks whether the file content is equal to a given text:

must.be.eq(txt : string)
must.be.eq(txt : string, msg : string)

must.not.be.eq(txt : string)
must.not.be.eq(txt : string, msg : string)

Asserting JSON files

must.be.json() and must.not.be.json()

Checks whether the file content is a JSON object:

must.be.json()
must.be.json(msg : string)

must.not.be.json()
must.not.be.json(msg : string)

json property

The file object contains a json property for returning the content as an object. We can use, for example, justo-assert to check the content:

file("myfile.json").json.must.be.eq({...});

Asserting YAML files

must.be.yaml() and must.not.be.yaml()

Checks whether the file is a YAML file:

must.be.yaml()
must.be.yaml(msg : string)

must.not.be.yaml()
must.not.be.yaml(msg : string)

yaml property

Similarly to json, the file object has a yaml property for returning the content as an object:

file("myfile.yml").yaml.must.be.eq({...});

Asserting text files

text property

Similarly to json and yaml, we also have the text property:

file("myfile.txt").text.must.be.eq({...});

Directory assertions

To assert directories, we have to use the dir() function as starting point:

dir(path : string)
dir(parent : string, name : string)

Once created the direcory object, we have to use the must property to assert.

Example:

const dir = require("justo-assert-fs").dir;

dir("/my/dir", "subdir").must.exist()

must.exist() and must.not.exist()

Checks whether the directory exists:

must.exist()
must.exist(msg : string)

must.not.exist()
must.not.exist(msg : string)

must.have() and must.not.have()

Checks whether the directory contains a specified entry set (file, directories...):

must.have(entry : string)
must.have(entry : string, msg : string)
must.have(entries : string[])
must.have(entries : string[], msg : string)

must.not.have(entry : string)
must.not.have(entry : string, msg : string)
must.not.have(entries : string[])
must.not.have(entries : string[], msg : string);