portfolio/packages/projector/spec/projector.spec.js

// const { Projector } = require('../lib/index.js');

let COUNTER = 0;

describe('Projector', () => {
	let projector;
	let container;

	beforeEach(() => {
		container = document.createElement('div');
		container.className = 'testContainer';
		document.body.appendChild(container);

		projector = Projector.Projector(container);
	});

	afterEach(() => {
		container.parentNode.removeChild(container);
		container = null;
	});

	function add(data, parentId = null, before) {
		projector.queueFrame([[0, parentId, data, before]]);
		return data.i;
	}

	function patch(id, props) {
		projector.queueFrame([[1, id, props]]);
	}

	function remove(id) {
		projector.queueFrame([[2, id]]);
	}

	function h(tagName, props, children = []) {
		return {
			t: 1,
			n: tagName,
			p: props,
			c: children,
			i: COUNTER++
		};
	}

	function waitForNextFrame() {
		return new Promise(resolve => {
			requestAnimationFrame(() => {
				setTimeout(resolve, 1);
			}, container);
		});
	}

	describe('getElement', () => {
		it('getElement(null) method should to return the container.', () => {
			expect(projector.getElement(null)).toBe(container);
		});

		it('getElement(id) method should to return the patched node.', () => {
			const id = add(h('div', { className: 'first' }));
			expect(projector.getElement(id)._id).toBe(id);
		});
	});

	describe('queueFrame', () => {
		describe('patch to add elements', () => {
			it('patch to add a basic element with a class', () => {
				expect(container.childNodes.length).toBe(0);

				const id = add(h('div', { className: 'first' }));

				expect(container.childNodes.length).toBe(1);
				const newEl = document.querySelector('.first');
				expect(newEl._id).toBe(id);
				expect(newEl.parentNode).toBe(container);
				expect(newEl.className).toBe('first');
			});

			it('patch to add a text element', () => {
				expect(container.childNodes.length).toBe(0);

				const id = add({
					t: 3,
					n: '',
					p: { textContent: 'howdy' },
					c: [],
					i: COUNTER++
				});

				expect(container.childNodes.length).toBe(1);
				const newEl = container.childNodes[0];
				expect(newEl._id).toBe(id);
				expect(newEl.parentNode).toBe(container);
				expect(newEl.textContent).toBe('howdy');
			});

			it('patch to add a sibling element with a class', done => {
				const id = add(h('div', { className: 'first' }));
				waitForNextFrame()
					.then(() => {
						const siblingId = add(h('div', { className: 'second' }), null, id);

						expect(container.childNodes.length).toBe(2);
						const el = document.querySelector('.second');
						expect(el._id).toBe(siblingId);
						expect(el.parentNode).toBe(container);
						expect(el.nextSibling._id).toBe(id);
					})
					.then(done)
					.catch(console.error.bind(console));
			});

			it('patch to add a tree of elements', () => {
				const id = add(h('div', {}, [h('span', { className: 'child' })]));
				const parent = projector.getElement(id);
				expect(container.childNodes.length).toBe(1);
				const child = parent.childNodes[0];
				expect(document.querySelector('.child')).toBe(child);
				expect(projector.getElement(child._id)).toBe(child);
			});
		});

		describe('patch to update elements', () => {
			it('patch to change a class', done => {
				const id = add(h('div', { className: 'first' }));
				waitForNextFrame()
					.then(() => {
						patch(id, { className: 'second' });

						expect(container.childNodes.length).toBe(1);
						const el = document.querySelector('.second');
						expect(el._id).toBe(id);
						expect(el.parentNode).toBe(container);
						expect(el.className).toBe('second');
					})
					.then(done)
					.catch(console.error.bind(console));
			});

			it('patch to update text', done => {
				expect(container.childNodes.length).toBe(0);

				const id = add({
					t: 3,
					n: '',
					p: { textContent: 'howdy' },
					c: [],
					i: COUNTER++
				});

				expect(container.childNodes.length).toBe(1);
				const newEl = container.childNodes[0];
				expect(newEl._id).toBe(id);
				expect(newEl.parentNode).toBe(container);
				expect(newEl.textContent).toBe('howdy');
				waitForNextFrame()
					.then(() => {
						patch(id, { textContent: 'pardner' });

						expect(newEl.textContent).toBe('pardner');
					})
					.then(done)
					.catch(console.error.bind(console));
			});
		});

		describe('patch to remove an element', () => {
			it('', done => {
				const id = add(h('div', {}, [h('span', { className: 'child' })]));
				const parent = projector.getElement(id);
				const child = parent.childNodes[0];
				expect(projector.getElement(child._id)).toBe(child);
				remove(child._id);
				waitForNextFrame()
					.then(() => {
						expect(parent.childNodes.length).toBe(0);
						expect(child.parentNode).toBe(null);
						expect(projector.getElement(child._id)).toBe(undefined);
					})
					.then(done)
					.catch(console.error.bind(console));
			});
		});
	});
});