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/**
* @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');
});
});
});
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