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367 lines
9.5 KiB
Markdown
367 lines
9.5 KiB
Markdown
_should_ is an expressive, readable, test framework agnostic, assertion library for [node](http://nodejs.org).
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It extends the Object prototype with a single non-enumerable getter that allows you to express how that object should behave.
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_should_ literally extends node's _assert_ module, in fact, it is node's assert module, for example `should.equal(str, 'foo')` will work, just as `assert.equal(str, 'foo')` would, and `should.AssertionError` **is** `assert.AssertionError`, meaning any test framework supporting this constructor will function properly with _should_.
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## Example
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var user = {
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name: 'tj'
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, pets: ['tobi', 'loki', 'jane', 'bandit']
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};
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user.should.have.property('name', 'tj');
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user.should.have.property('pets').with.lengthOf(4);
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someAsyncTask(foo, function(err, result){
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should.not.exist(err);
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should.exist(result);
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result.bar.should.equal(foo);
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});
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## Installation
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$ npm install should
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## assert extras
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As mentioned above, _should_ extends node's _assert_. The returned object from `require('should')` is thus similar to the returned object from `require('assert')`, but it has one extra convenience method:
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should.exist('hello')
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should.exist([])
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should.exist(null) // will throw
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This is equivalent to `should.ok`, which is equivalent to `assert.ok`, but reads a bit better. It gets better, though:
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should.not.exist(false)
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should.not.exist('')
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should.not.exist({}) // will throw
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We may add more _assert_ extras in the future... ;)
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## chaining assertions
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Some assertions can be chained, for example if a property is volatile we can first assert property existence:
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user.should.have.property('pets').with.lengthOf(4)
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which is essentially equivalent to below, however the property may not exist:
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user.pets.should.have.lengthOf(4)
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our dummy getters such as _and_ also help express chaining:
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user.should.be.a('object').and.have.property('name', 'tj')
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## exist (static)
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The returned object from `require('should')` is the same object as `require('assert')`. So you can use `should` just like `assert`:
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should.fail('expected an error!')
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should.strictEqual(foo, bar)
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In general, using the Object prototype's _should_ is nicer than using these `assert` equivalents, because _should_ gives you access to the expressive and readable language described above:
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foo.should.equal(bar) // same as should.strictEqual(foo, bar) above
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The only exception, though, is when you can't be sure that a particular object exists. In that case, attempting to access the _should_ property may throw a TypeError:
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foo.should.equal(bar) // throws if foo is null or undefined!
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For this case, `require('should')` extends `require('assert')` with an extra convenience method to check whether an object exists:
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should.exist({})
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should.exist([])
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should.exist('')
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should.exist(0)
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should.exist(null) // will throw
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should.exist(undefined) // will throw
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You can also check the negation:
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should.not.exist(undefined)
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should.not.exist(null)
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should.not.exist('') // will throw
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should.not.exist({}) // will throw
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Once you know an object exists, you can safely use the _should_ property on it.
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## ok
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Assert truthfulness:
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true.should.be.ok
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'yay'.should.be.ok
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(1).should.be.ok
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or negated:
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false.should.not.be.ok
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''.should.not.be.ok
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(0).should.not.be.ok
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## true
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Assert === true:
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true.should.be.true
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'1'.should.not.be.true
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## false
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Assert === false:
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false.should.be.false
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(0).should.not.be.false
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## arguments
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Assert `Arguments`:
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var args = (function(){ return arguments; })(1,2,3);
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args.should.be.arguments;
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[].should.not.be.arguments;
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## empty
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Asserts that length is 0:
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[].should.be.empty
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''.should.be.empty
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({ length: 0 }).should.be.empty
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## eql
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equality:
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({ foo: 'bar' }).should.eql({ foo: 'bar' })
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[1,2,3].should.eql([1,2,3])
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## equal
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strict equality:
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should.strictEqual(undefined, value)
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should.strictEqual(false, value)
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(4).should.equal(4)
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'test'.should.equal('test')
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[1,2,3].should.not.equal([1,2,3])
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## within
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Assert inclusive numeric range:
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user.age.should.be.within(5, 50)
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## a
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Assert __typeof__:
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user.should.be.a('object')
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'test'.should.be.a('string')
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## instanceof
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Assert __instanceof__:
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user.should.be.an.instanceof(User)
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[].should.be.an.instanceof(Array)
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## above
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Assert numeric value above the given value:
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user.age.should.be.above(5)
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user.age.should.not.be.above(100)
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## below
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Assert numeric value below the given value:
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user.age.should.be.below(100)
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user.age.should.not.be.below(5)
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## match
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Assert regexp match:
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username.should.match(/^\w+$/)
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## length
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Assert _length_ property exists and has a value of the given number:
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user.pets.should.have.length(5)
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user.pets.should.have.a.lengthOf(5)
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Aliases: _lengthOf_
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## property
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Assert property exists and has optional value:
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user.should.have.property('name')
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user.should.have.property('age', 15)
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user.should.not.have.property('rawr')
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user.should.not.have.property('age', 0)
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## ownProperty
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Assert own property (on the immediate object):
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({ foo: 'bar' }).should.have.ownProperty('foo')
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## status(code)
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Asserts that `.statusCode` is `code`:
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res.should.have.status(200);
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## header(field[, value])
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Asserts that a `.headers` object with `field` and optional `value` are present:
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res.should.have.header('content-length');
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res.should.have.header('Content-Length', '123');
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res.should.have.header('content-length', '123');
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## json
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Assert that Content-Type is "application/json; charset=utf-8"
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res.should.be.json
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## html
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Assert that Content-Type is "text/html; charset=utf-8"
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res.should.be.html
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## include(obj)
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Assert that the given `obj` is present via `indexOf()`, so this works for strings, arrays, or custom objects implementing indexOf:
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Assert array value:
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[1,2,3].should.include(3)
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[1,2,3].should.include(2)
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[1,2,3].should.not.include(4)
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Assert substring:
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'foo bar baz'.should.include('foo')
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'foo bar baz'.should.include('bar')
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'foo bar baz'.should.include('baz')
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'foo bar baz'.should.not.include('FOO')
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## includeEql(obj)
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Assert that an object equal to the given `obj` is present in an Array:
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[[1],[2],[3]].should.includeEql([3])
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[[1],[2],[3]].should.includeEql([2])
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[[1],[2],[3]].should.not.includeEql([4])
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## throw()
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Assert an exception is thrown:
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```js
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(function(){
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throw new Error('fail');
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}).should.throw();
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```
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Assert an exception is not thrown:
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```js
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(function(){
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}).should.not.throw();
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```
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Assert exepection message matches string:
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```js
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(function(){
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throw new Error('fail');
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}).should.throw('fail');
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```
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Assert exepection message matches regexp:
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```js
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(function(){
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throw new Error('failed to foo');
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}).should.throw(/^fail/);
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```
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## keys
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Assert own object keys, which must match _exactly_,
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and will fail if you omit a key or two:
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var obj = { foo: 'bar', baz: 'raz' };
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obj.should.have.keys('foo', 'bar');
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obj.should.have.keys(['foo', 'bar']);
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## Optional Error description
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As it can often be difficult to assertain exactly where failed assertions are comming from in your tests, an optional description parameter can be passed to several should matchers. The description will follow the failed assertion in the error:
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(1).should.eql(0, 'some useful description')
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AssertionError: expected 1 to equal 0 | some useful description
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at Object.eql (/Users/swift/code/should.js/node_modules/should/lib/should.js:280:10)
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...
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The methods that support this optional description are: `eql`, `equal`, `within`, `a`, `instanceof`, `above`, `below`, `match`, `length`, `property`, `ownProperty`, `include`, and `includeEql`.
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## Express example
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For example you can use should with the [Expresso TDD Framework](http://github.com/visionmedia/expresso) by simply including it:
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var lib = require('mylib')
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, should = require('should');
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module.exports = {
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'test .version': function(){
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lib.version.should.match(/^\d+\.\d+\.\d+$/);
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}
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};
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## Running tests
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To run the tests for _should_ simple update your git submodules and run:
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$ make test
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## OMG IT EXTENDS OBJECT???!?!@
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Yes, yes it does, with a single getter _should_, and no it wont break your code, because it does this **properly** with a non-enumerable property.
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## License
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(The MIT License)
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Copyright (c) 2010-2011 TJ Holowaychuk <tj@vision-media.ca>
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Copyright (c) 2011 Aseem Kishore <aseem.kishore@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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'Software'), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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