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import { mount } from '@vue/test-utils';
import Vue from 'vue';
import SmartVirtualScrollList from '~/vue_shared/components/smart_virtual_list.vue';
describe('Toggle Button', () => {
let vm;
const createComponent = ({ length, remain }) => {
const smartListProperties = {
rtag: 'section',
wtag: 'ul',
wclass: 'test-class',
// Size in pixels does not matter for our tests here
size: 35,
length,
remain,
};
const Component = Vue.extend({
components: {
SmartVirtualScrollList,
},
smartListProperties,
items: Array(length).fill(1),
template: `
<smart-virtual-scroll-list v-bind="$options.smartListProperties">
<li v-for="(val, key) in $options.items" :key="key">{{ key + 1 }}</li>
</smart-virtual-scroll-list>`,
});
return mount(Component).vm;
};
afterEach(() => {
vm.$destroy();
});
describe('if the list is shorter than the maximum shown elements', () => {
const listLength = 10;
beforeEach(() => {
vm = createComponent({ length: listLength, remain: 20 });
});
it('renders without the vue-virtual-scroll-list component', () => {
expect(vm.$el.classList).not.toContain('js-virtual-list');
expect(vm.$el.classList).toContain('js-plain-element');
});
it('renders list with provided tags and classes for the wrapper elements', () => {
expect(vm.$el.tagName).toEqual('SECTION');
expect(vm.$el.firstChild.tagName).toEqual('UL');
expect(vm.$el.firstChild.classList).toContain('test-class');
});
it('renders all children list elements', () => {
expect(vm.$el.querySelectorAll('li').length).toEqual(listLength);
});
});
describe('if the list is longer than the maximum shown elements', () => {
const maxItemsShown = 20;
beforeEach(() => {
vm = createComponent({ length: 1000, remain: maxItemsShown });
});
it('uses the vue-virtual-scroll-list component', () => {
expect(vm.$el.classList).toContain('js-virtual-list');
expect(vm.$el.classList).not.toContain('js-plain-element');
});
it('renders list with provided tags and classes for the wrapper elements', () => {
expect(vm.$el.tagName).toEqual('SECTION');
expect(vm.$el.firstChild.tagName).toEqual('UL');
expect(vm.$el.firstChild.classList).toContain('test-class');
});
it('renders at max twice the maximum shown elements', () => {
expect(vm.$el.querySelectorAll('li').length).toBeLessThanOrEqual(2 * maxItemsShown);
});
});
});
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