162 lines
4.7 KiB
Markdown
162 lines
4.7 KiB
Markdown
# assert-plus
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This library is a super small wrapper over node's assert module that has two
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things: (1) the ability to disable assertions with the environment variable
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NODE\_NDEBUG, and (2) some API wrappers for argument testing. Like
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`assert.string(myArg, 'myArg')`. As a simple example, most of my code looks
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like this:
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```javascript
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var assert = require('assert-plus');
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function fooAccount(options, callback) {
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assert.object(options, 'options');
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assert.number(options.id, 'options.id');
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assert.bool(options.isManager, 'options.isManager');
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assert.string(options.name, 'options.name');
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assert.arrayOfString(options.email, 'options.email');
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assert.func(callback, 'callback');
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// Do stuff
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callback(null, {});
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}
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```
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# API
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All methods that *aren't* part of node's core assert API are simply assumed to
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take an argument, and then a string 'name' that's not a message; `AssertionError`
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will be thrown if the assertion fails with a message like:
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AssertionError: foo (string) is required
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at test (/home/mark/work/foo/foo.js:3:9)
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at Object.<anonymous> (/home/mark/work/foo/foo.js:15:1)
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at Module._compile (module.js:446:26)
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at Object..js (module.js:464:10)
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at Module.load (module.js:353:31)
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at Function._load (module.js:311:12)
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at Array.0 (module.js:484:10)
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at EventEmitter._tickCallback (node.js:190:38)
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from:
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```javascript
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function test(foo) {
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assert.string(foo, 'foo');
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}
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```
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There you go. You can check that arrays are of a homogeneous type with `Arrayof$Type`:
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```javascript
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function test(foo) {
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assert.arrayOfString(foo, 'foo');
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}
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```
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You can assert IFF an argument is not `undefined` (i.e., an optional arg):
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```javascript
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assert.optionalString(foo, 'foo');
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```
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Lastly, you can opt-out of assertion checking altogether by setting the
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environment variable `NODE_NDEBUG=1`. This is pseudo-useful if you have
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lots of assertions, and don't want to pay `typeof ()` taxes to v8 in
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production. Be advised: The standard functions re-exported from `assert` are
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also disabled in assert-plus if NDEBUG is specified. Using them directly from
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the `assert` module avoids this behavior.
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The complete list of APIs is:
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* assert.array
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* assert.bool
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* assert.buffer
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* assert.func
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* assert.number
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* assert.finite
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* assert.object
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* assert.string
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* assert.stream
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* assert.date
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* assert.regexp
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* assert.uuid
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* assert.arrayOfArray
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* assert.arrayOfBool
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* assert.arrayOfBuffer
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* assert.arrayOfFunc
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* assert.arrayOfNumber
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* assert.arrayOfFinite
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* assert.arrayOfObject
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* assert.arrayOfString
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* assert.arrayOfStream
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* assert.arrayOfDate
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* assert.arrayOfRegexp
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* assert.arrayOfUuid
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* assert.optionalArray
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* assert.optionalBool
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* assert.optionalBuffer
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* assert.optionalFunc
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* assert.optionalNumber
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* assert.optionalFinite
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* assert.optionalObject
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* assert.optionalString
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* assert.optionalStream
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* assert.optionalDate
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* assert.optionalRegexp
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* assert.optionalUuid
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* assert.optionalArrayOfArray
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* assert.optionalArrayOfBool
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* assert.optionalArrayOfBuffer
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* assert.optionalArrayOfFunc
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* assert.optionalArrayOfNumber
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* assert.optionalArrayOfFinite
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* assert.optionalArrayOfObject
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* assert.optionalArrayOfString
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* assert.optionalArrayOfStream
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* assert.optionalArrayOfDate
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* assert.optionalArrayOfRegexp
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* assert.optionalArrayOfUuid
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* assert.AssertionError
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* assert.fail
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* assert.ok
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* assert.equal
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* assert.notEqual
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* assert.deepEqual
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* assert.notDeepEqual
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* assert.strictEqual
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* assert.notStrictEqual
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* assert.throws
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* assert.doesNotThrow
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* assert.ifError
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# Installation
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npm install assert-plus
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## License
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The MIT License (MIT)
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Copyright (c) 2012 Mark Cavage
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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## Bugs
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See <https://github.com/mcavage/node-assert-plus/issues>.
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