expect.as

BDD-style assertion library for Action Script 3

API

ok: asserts that the value is truthy or not

expect(true).to.be.ok();
expect(false).not.to.be.ok();
expect("everything").to.be.ok();
expect(null).not.to.be.ok();
expect(undefined).not.to.be.ok();

truthy: asserts that the value equals true

expect(true).to.be.truthy();
expect(0).not.to.be.truthy();

false: asserts that the value equals false

expect(false).to.be.falsy();
expect(1).not.to.be.falsy();

undef: asserts that the value is undefined

expect(undefined).to.be.undef();
expect(100).not.to.be.undef();

nill: asserts that the value is null

expect(undefined).to.be.nill();
expect(100).not.to.be.nill();

exist: asserts that the value is not null or undefined

expect(null).not.to.exist();
expect(undefined).not.to.exist();
expect(100).to.exist();

empty: asserts that the value is empty

expect([]).to.be.empty();
expect({}).to.be.empty();
expect("").to.be.empty();

equal: asserts that the values are equal (==)

expect(123).to.equal(123);
expect("test").not.to.equal(123);

be a / be an: asserts that the value is instance of given class

expect(123).to.be.a(Number);
expect("test").not.to.be.an(Array);
expect(sprite).to.be.a("flash.display::Sprite");

contain: asserts that the array contains value

expect([1, 2, 3]).to.contain(2);
expect("one two three").not.to.contain("four");
expect(sprite).to.contain(anotherSprite);
expect(starlingSprite).not.to.contain(anotherStarlingSprite);

have property: asserts that the value has own property

expect({name: "Bruce Wayne"}).to.have.property("name");
expect({name: "Bruce Wayne"}).not.to.have.property("age");

have length: asserts that array has length of given array or object

expect([1, 2, 3]).to.have.length(3);
expect([1, 2, 3]).not.to.have.length(0);
expect({a: 10, b: 20, c: 30}).to.have.length(3);
expect("test").to.have.length(4);

dispatch: asserts that the event dispatcher dispatches given event type (works also with Starling EventDispatcher)

expect(dispatcher).to.dispatch(Event.CHANGE);
expect(starlingDispatcher).to.dispatch(EnterFrameEvent.ENTER_FRAME);
expect(dispatcher).not.to.dispatch(CustomEvent.CUSTOM_TYPE);

strictly equal: asserts that the values are strictly equal (===)

expect(123).to.strictly.equal(123);
expect("123").not.to.strictly.equal(123);

deeply equal: asserts that the values are deeply equal

expect({a: 1, b: {c: "test", d: [1, 2, 3]}).to.deeply.equal({a: 1, b: {c: "test", d: [1, 2, 3]});

match: asserts that the value matches given regular expression

expect("foo@bar.com").to.match(/[a-z0-9.]+@[a-z0-9.]+.[a-z]{2,4}/);

raise: asserts that the value matches given regular expression

expect(someFunction).to.raise();
expect(someOtherFunction).not.to.raise(ArgumentError);
expect(yetAnotherFunction).not.to.raise(Error, /[a-zA-Z]/);
expect(yetAnotherFunction).to.raise(Error, "Unexpected error");

closeTo: asserts that the expected is equal given value, to within a +/- delta range

expect(2).to.be.closeTo(1.5, .5);

between: asserts that the value is between given numbers

expect(2).to.be.between(1, 3);
expect(2).to.be.between(1, 2, true); //3rd parameter means strong inequality

above: asserts that expected value is greater then given value

expect(10).to.be.above(5)

below: asserts that expected value is lower then given value

expect(5).to.be.below(10)

at least: asserts that expected value is greater or equal to given value

expect(10).to.be.at.least(5);
expect(5).to.be.at.least(5);

at most: asserts that expected value is lower or equal to given value

expect(5).to.be.at.most(10);
expect(10).to.be.at.most(10);

fail: throws ExpectationError

expect().fail();
expect().fail("It did not meet expectations");

TODO

• Got an idea for new expression? Don't hesitate to create an issue or send pull request.

Features / Goals

• BDD-style
• Make use of IDE's code completion
• Compatible with FlexUnit

Inspirations

• chai.js
• expect.js