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[rbdr/forum] / src / lib / animations / blink.test.ts
1 /**
2 * @jest-environment jsdom
3 */
4
5 import { blink } from './blink';
6 import { sineOut } from 'svelte/easing';
7
8 const internals = {
9 response: null
10 };
11
12 describe('blink', () => {
13
14 test('it has a default delay of 0ms', () => {
15
16 const response = blink(document.createElement('div'), {});
17
18 expect(response.delay).toBe(0);
19 });
20
21 test('it allows delay to be overridden', () => {
22
23 const response = blink(document.createElement('div'), {
24 delay: 300
25 });
26
27 expect(response.delay).toBe(300);
28 });
29
30 test('it has a default duration of 400ms', () => {
31
32 const response = blink(document.createElement('div'), {});
33
34 expect(response.duration).toBe(400);
35 });
36
37 test('it allows delay to be overridden', () => {
38
39 const response = blink(document.createElement('div'), {
40 duration: 999
41 });
42
43 expect(response.duration).toBe(999);
44 });
45
46 test('it uses sineOut as the default easing function', () => {
47
48 const response = blink(document.createElement('div'), {});
49
50 expect(response.easing).toBe(sineOut);
51 });
52
53 test('it allows easing function to be overridden', () => {
54
55 const response = blink(document.createElement('div'), {
56 easing: () => 666
57 });
58
59 expect(response.easing(0)).toBe(666);
60 });
61
62 describe('css animation function', () => {
63
64 beforeEach(() => {
65
66 const div = document.createElement('div');
67 div.style.width = '100px';
68 div.style.height = '200px';
69 internals.response = blink(div, {});
70 });
71
72 test('It starts with with zeroed width and height', () => {
73
74 const css = internals.response.css(0, 1);
75 expect(css).toContain('width: 0px');
76 expect(css).toContain('height: 0px');
77 });
78
79 test('It grows to full height and 0 width in first 20%', () => {
80
81 const css = internals.response.css(0.2, 0.8);
82 expect(css).toContain('width: 0px');
83 expect(css).toContain('height: 200px');
84 });
85
86 test('It expands to full height by the end', () => {
87
88 const css = internals.response.css(1, 0);
89 expect(css).toContain('width: 100px');
90 expect(css).toContain('height: 200px');
91 });
92
93 test('It keeps element vertically centered by adjusting the margin', () => {
94
95 const css = internals.response.css(0.1, 0.9);
96 expect(css).toContain('margin: 50px 50px');
97 expect(css).toContain('height: 100px');
98 });
99
100 test('It keeps element horizontally centered by adjusting the margin', () => {
101
102 const css = internals.response.css(0.6, 0.4);
103 expect(css).toContain('margin: 0px 25px');
104 expect(css).toContain('width: 50px');
105 });
106 });
107 });