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[rbdr/forum] / src / lib / animations / blink.test.ts

/**
 * @jest-environment jsdom
 */

import { blink } from './blink';
import { sineOut } from 'svelte/easing';

const internals = {
	response: null
};

describe('blink', () => {
	test('it has a default delay of 0ms', () => {
		const response = blink(document.createElement('div'), {});

		expect(response.delay).toBe(0);
	});

	test('it allows delay to be overridden', () => {
		const response = blink(document.createElement('div'), {
			delay: 300
		});

		expect(response.delay).toBe(300);
	});

	test('it has a default duration of 400ms', () => {
		const response = blink(document.createElement('div'), {});

		expect(response.duration).toBe(400);
	});

	test('it allows delay to be overridden', () => {
		const response = blink(document.createElement('div'), {
			duration: 999
		});

		expect(response.duration).toBe(999);
	});

	test('it uses sineOut as the default easing function', () => {
		const response = blink(document.createElement('div'), {});

		expect(response.easing).toBe(sineOut);
	});

	test('it allows easing function to be overridden', () => {
		const response = blink(document.createElement('div'), {
			easing: () => 666
		});

		expect(response.easing(0)).toBe(666);
	});

	describe('css animation function', () => {
		beforeEach(() => {
			const div = document.createElement('div');
			div.style.width = '100px';
			div.style.height = '200px';
			internals.response = blink(div, {});
		});

		test('It starts with with zeroed width and height', () => {
			const css = internals.response.css(0, 1);
			expect(css).toContain('width: 0px');
			expect(css).toContain('height: 0px');
		});

		test('It grows to full height and 0 width in first 20%', () => {
			const css = internals.response.css(0.2, 0.8);
			expect(css).toContain('width: 0px');
			expect(css).toContain('height: 200px');
		});

		test('It expands to full height by the end', () => {
			const css = internals.response.css(1, 0);
			expect(css).toContain('width: 100px');
			expect(css).toContain('height: 200px');
		});

		test('It keeps element vertically centered by adjusting the margin', () => {
			const css = internals.response.css(0.1, 0.9);
			expect(css).toContain('margin: 50px 50px');
			expect(css).toContain('height: 100px');
		});

		test('It keeps element horizontally centered by adjusting the margin', () => {
			const css = internals.response.css(0.6, 0.4);
			expect(css).toContain('margin: 0px 25px');
			expect(css).toContain('width: 50px');
		});
	});
});