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import hljs from 'highlight.js/lib/core';
import { GlLoadingIcon } from '@gitlab/ui';
import Vue, { nextTick } from 'vue';
import VueRouter from 'vue-router';
import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
import SourceViewer from '~/vue_shared/components/source_viewer/source_viewer.vue';
import { ROUGE_TO_HLJS_LANGUAGE_MAP } from '~/vue_shared/components/source_viewer/constants';
import LineNumbers from '~/vue_shared/components/line_numbers.vue';
import waitForPromises from 'helpers/wait_for_promises';
import * as sourceViewerUtils from '~/vue_shared/components/source_viewer/utils';
jest.mock('highlight.js/lib/core');
Vue.use(VueRouter);
const router = new VueRouter();
describe('Source Viewer component', () => {
let wrapper;
const language = 'docker';
const mappedLanguage = ROUGE_TO_HLJS_LANGUAGE_MAP[language];
const content = `// Some source code`;
const DEFAULT_BLOB_DATA = { language, rawTextBlob: content };
const highlightedContent = `<span data-testid='test-highlighted' id='LC1'>${content}</span><span id='LC2'></span>`;
const createComponent = async (blob = {}) => {
wrapper = shallowMountExtended(SourceViewer, {
router,
propsData: { blob: { ...DEFAULT_BLOB_DATA, ...blob } },
});
await waitForPromises();
};
const findLoadingIcon = () => wrapper.findComponent(GlLoadingIcon);
const findLineNumbers = () => wrapper.findComponent(LineNumbers);
const findHighlightedContent = () => wrapper.findByTestId('test-highlighted');
const findFirstLine = () => wrapper.find('#LC1');
beforeEach(() => {
hljs.highlight.mockImplementation(() => ({ value: highlightedContent }));
hljs.highlightAuto.mockImplementation(() => ({ value: highlightedContent }));
jest.spyOn(sourceViewerUtils, 'wrapLines');
return createComponent();
});
afterEach(() => wrapper.destroy());
describe('highlight.js', () => {
it('registers the language definition', async () => {
const languageDefinition = await import(`highlight.js/lib/languages/${mappedLanguage}`);
expect(hljs.registerLanguage).toHaveBeenCalledWith(
mappedLanguage,
languageDefinition.default,
);
});
it('highlights the content', () => {
expect(hljs.highlight).toHaveBeenCalledWith(content, { language: mappedLanguage });
});
describe('auto-detects if a language cannot be loaded', () => {
beforeEach(() => createComponent({ language: 'some_unknown_language' }));
it('highlights the content with auto-detection', () => {
expect(hljs.highlightAuto).toHaveBeenCalledWith(content);
});
});
});
describe('rendering', () => {
it('renders a loading icon if no highlighted content is available yet', async () => {
hljs.highlight.mockImplementation(() => ({ value: null }));
await createComponent();
expect(findLoadingIcon().exists()).toBe(true);
});
it('calls the wrapLines helper method with highlightedContent and mappedLanguage', () => {
expect(sourceViewerUtils.wrapLines).toHaveBeenCalledWith(highlightedContent, mappedLanguage);
});
it('renders Line Numbers', () => {
expect(findLineNumbers().props('lines')).toBe(1);
});
it('renders the highlighted content', () => {
expect(findHighlightedContent().exists()).toBe(true);
});
});
describe('selecting a line', () => {
let firstLine;
let firstLineElement;
beforeEach(() => {
firstLine = findFirstLine();
firstLineElement = firstLine.element;
jest.spyOn(firstLineElement, 'scrollIntoView');
jest.spyOn(firstLineElement.classList, 'add');
jest.spyOn(firstLineElement.classList, 'remove');
});
it('adds the highlight (hll) class', async () => {
wrapper.vm.$router.push('#LC1');
await nextTick();
expect(firstLineElement.classList.add).toHaveBeenCalledWith('hll');
});
it('removes the highlight (hll) class from a previously highlighted line', async () => {
wrapper.vm.$router.push('#LC2');
await nextTick();
expect(firstLineElement.classList.remove).toHaveBeenCalledWith('hll');
});
it('scrolls the line into view', () => {
expect(firstLineElement.scrollIntoView).toHaveBeenCalledWith({
behavior: 'smooth',
block: 'center',
});
});
});
});
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