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mutate-fs-2.1.1
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مشاهده بیشترتوضیحات
Mutate the filesystem behavior for tests.
| ویژگی | مقدار |
|---|---|
| سیستم عامل | - |
| نام فایل | mutate-fs-2.1.1 |
| نام | mutate-fs |
| نسخه کتابخانه | 2.1.1 |
| نگهدارنده | ['isaacs'] |
| ایمیل نگهدارنده | ['i@izs.me'] |
| نویسنده | Isaac Z. Schlueter |
| ایمیل نویسنده | i@izs.me |
| آدرس صفحه اصلی | git+https://github.com/isaacs/mutate-fs.git |
| آدرس اینترنتی | https://github.com/isaacs/mutate-fs#readme |
| مجوز | ISC |
# mutate-fs
Mutate the filesystem behavior for tests.
This is not a full-fledged filesystem mock library as much as it is a
way to just modify the data that's returned, especially to trigger
cases where the fs is a bit of a jerk, and you want to make sure your
code handles it properly.
All of the methods return a function that restores the default
behavior.
You should probably not use this module outside of a test environment.
By design, it does bad things that will probably break stuff.
## USAGE
```js
const mutateFS = require('mutate-fs')
// you can of course us this with any test harness,
// including "plain old assert", but showing TAP because I like it.
const t = require('tap')
t.test('test what happens when stat fails', t => {
// restore normalcy after this test
t.tearDown(mutateFS.statFail(new Error('pwn')))
// verify that statting this file (which exists) throws our error
t.throws(_ => {
fs.statSync(__filename)
}, new Error('pwn'))
t.end()
})
// plain-old-assert example
// make stat lie
const restore = mutateFS.statType('Directory')
const assert = require('assert')
assert(fs.statSync(__filename).isDirectory())
restore()
assert(fs.statSync(__filename).isFile())
```
## METHODS
### fail(method, error)
Whenever `fs[method]` is called, call the callback with the supplied
error. Whenever `fs[methodSync]` is called, throw the supplied error.
Note that this means that the actual underlying fs method is not called.
Error is decorated with a `callstack` string, which is the stack where
the fail method was actually called from.
### pass(method, data)
The oppose of `fail`. Whenever `fs[method]` is called, call the
callback with the supplied data and no error. Whenever
`fs[methodSync]` is called, return the supplied data.
Note that this means that the actual underlying fs method is not called.
### mutate(method, fn)
Whenever `fs[method]` or `fs[methodSync]` is called, apply the
`fn(error, data)` to the results.
`fn` can either mutate the data in-place (and return nothing) or can
return a `[error, data]` array which is treated as the new result.
### mutateArgs(method, fn)
Mutate the arguments passed _into_ the fs method specified.
`fn` takes an array of arguments, and should return the munged set of
arguments to call the method with.
### zenoRead()
Make all `read()` calls appear to return half as many bytes. This
exercises frequently overlooked edge cases in many programs that call
`fs.read()` directly.
As of version 2, this works by modifying the `length` argument passed
to `fs.read` and `fs.readSync'. In version 1.x of this library, it
only modified the _reported_ number of bytes read, limiting its
utility for testing shortened non-positioned (file-scanning) reads.
The name is a reference to [Zeno's Paradox of Achilles and the
Tortoise](https://en.wikipedia.org/wiki/Zeno%27s_paradoxes#Achilles_and_the_tortoise).
### delay(method, ms)
Delay calls to fs[method] by the specified number of milliseconds.
Delays sync calls by doing a bunch of unnecessary file reads in a
busy-loop.
### statFail(error)
Like `fail()`, but called on all three of fstat, lstat, and stat.
### statMutate(fn)
Like `mutate()`, but called on all three of fstat, lstat, and stat.
### statType(type)
Mutate stat, lstat, and fstat return values to make them appear to be
the provided type. That is, `stat.is<Type>` will return true.
Type must be one of: `'File'`, `'Directory'`, `'CharacterDevice'`,
`'BlockDevice'`, `'FIFO'`, `'SymbolicLink'`, or `'Socket'`.
زبان مورد نیاز
| مقدار | نام |
|---|---|
| 8.7.0 | Npm |
نحوه نصب
نصب پکیج tgz mutate-fs-2.1.1:
npm install mutate-fs-2.1.1.tgz