cheatsheets/chai.md

title: Chai

Assert

assert(val)
assert.fail(actual, expected)
assert.ok(val) // is truthy
assert.equal(actual, expected) // 'compare with =='
assert.strictEqual
assert.deepEqual

assert.isTrue
assert.isFalse

assert.isNull
assert.isNotNull
assert.isUndefined
assert.isDefined
assert.isFunction
assert.isObject
assert.isArray
assert.isString
assert.isNumber
assert.isBoolean

assert.typeOf(/tea/, 'regexp') // Object.prototype.toString()
assert.instanceOf(chai, Tea)
assert.include([ a,b,c ], a)
assert.match(val, /regexp/)
assert.property(obj, 'tea') // 'tea' in object
assert.deepProperty(obj, 'tea.green')
assert.propertyVal(person, 'name', 'John')
assert.deepPropertyVal(post, 'author.name', 'John')

assert.lengthOf(object, 3)
assert.throws(function() { ... })
assert.throws(function() { ... }, /reference error/)
assert.doesNotThrow

assert.operator(1, '<', 2)
assert.closeTo(actual, expected)

Should: chains

.to .be .been .is .that .and .have .with .at .of .same

Should not

expect(object).not.equal('x')

Expectations

expect(object)
  .equal(expected)
  .eql // deepequal
  .deep.equal(expected)
  .be.a('string')
  .include(val)

  .be.ok(val)
  .be.true
  .be.false

  .be.null
  .be.undefined
  .be.empty
  .be.arguments
  .be.function

  .exist
  expect(10).above(5)

References

• http://chaijs.com/api/assert/