斷言函式庫 Chai

斷言函式庫 (assertion library)

Chai Assertion Library

Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any javascript testing framework.

Chai 是一個 BDD / TDD 基於 NodeJS 的斷言函式庫,可以與任何 javascript 測試框架一起使用。

Chai has several interfaces that allow the developer to choose the most comfortable. The chain-capable BDD styles provide an expressive language & readable style, while the TDD assert style provides a more classical feel.

Chai 提供數種 interfaces,供使用者選擇最習慣的方式,chain-capable BDD 風格提供的是豐富的呈現方式跟可讀性,TDD assert 風格則是提供更經典的使用方式。

Should

chai.should();

foo.should.be.a('string');
foo.should.equal('bar');
foo.should.have.lengthOf(3);
tea.should.have.property('flavors')
  .with.lengthOf(3);

Expect

var expect = chai.expect;

expect(foo).to.be.a('string');
expect(foo).to.equal('bar');
expect(foo).to.have.lengthOf(3);
expect(tea).to.have.property('flavors')
  .with.lengthOf(3);

Assert

var assert = chai.assert;

assert.typeOf(foo, 'string');
assert.equal(foo, 'bar');
assert.lengthOf(foo, 3)
assert.property(tea, 'flavors');
assert.lengthOf(tea.flavors, 3);

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