1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
import { nextTick } from 'vue';
import { GlIntersectionObserver } from '@gitlab/ui';
import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
import Chunk from '~/vue_shared/components/source_viewer/components/chunk_new.vue';
import { CHUNK_1, CHUNK_2 } from '../mock_data';
describe('Chunk component', () => {
let wrapper;
let idleCallbackSpy;
const createComponent = (props = {}) => {
wrapper = shallowMountExtended(Chunk, {
propsData: { ...CHUNK_1, ...props },
});
};
const findIntersectionObserver = () => wrapper.findComponent(GlIntersectionObserver);
const findLineNumbers = () => wrapper.findAllByTestId('line-numbers');
const findContent = () => wrapper.findByTestId('content');
beforeEach(() => {
idleCallbackSpy = jest.spyOn(window, 'requestIdleCallback').mockImplementation((fn) => fn());
createComponent();
});
describe('Intersection observer', () => {
it('renders an Intersection observer component', () => {
expect(findIntersectionObserver().exists()).toBe(true);
});
it('renders highlighted content if appear event is emitted', async () => {
createComponent({ chunkIndex: 1, isHighlighted: false });
findIntersectionObserver().vm.$emit('appear');
await nextTick();
expect(findContent().exists()).toBe(true);
expect(wrapper.emitted('appear')).toHaveLength(1);
});
});
describe('rendering', () => {
it('does not register window.requestIdleCallback for the first chunk, renders content immediately', () => {
expect(window.requestIdleCallback).not.toHaveBeenCalled();
expect(findContent().text()).toBe(CHUNK_1.highlightedContent);
});
it('does not render content if browser is not in idle state', () => {
idleCallbackSpy.mockRestore();
createComponent({ chunkIndex: 1, ...CHUNK_2 });
expect(findLineNumbers()).toHaveLength(0);
expect(findContent().exists()).toBe(false);
});
describe('isHighlighted is false', () => {
beforeEach(() => createComponent(CHUNK_2));
it('does not render line numbers', () => {
expect(findLineNumbers()).toHaveLength(0);
});
it('renders raw content', () => {
expect(findContent().text()).toBe(CHUNK_2.rawContent);
});
});
describe('isHighlighted is true', () => {
beforeEach(() => createComponent({ ...CHUNK_2, isHighlighted: true }));
it('renders line numbers', () => {
expect(findLineNumbers()).toHaveLength(CHUNK_2.totalLines);
// Opted for a snapshot test here since the output is simple and verifies native HTML elements
expect(findLineNumbers().at(0).element).toMatchSnapshot();
});
it('renders highlighted content', () => {
expect(findContent().text()).toBe(CHUNK_2.highlightedContent);
});
});
});
});
|
