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import { shallowMount } from '@vue/test-utils';
import axios from 'axios';
import MockAdapter from 'axios-mock-adapter';
import { splitIntoChunks } from '~/vue_shared/components/source_viewer/workers/highlight_utils';
import highlightMixin from '~/repository/mixins/highlight_mixin';
import LineHighlighter from '~/blob/line_highlighter';
import waitForPromises from 'helpers/wait_for_promises';
import { HTTP_STATUS_OK } from '~/lib/utils/http_status';
import { TEXT_FILE_TYPE } from '~/repository/constants';
import {
LINES_PER_CHUNK,
EVENT_ACTION,
EVENT_LABEL_FALLBACK,
} from '~/vue_shared/components/source_viewer/constants';
import Tracking from '~/tracking';
const lineHighlighter = new LineHighlighter();
jest.mock('~/blob/line_highlighter', () => jest.fn().mockReturnValue({ highlightHash: jest.fn() }));
jest.mock('~/vue_shared/components/source_viewer/workers/highlight_utils', () => ({
splitIntoChunks: jest.fn().mockResolvedValue([]),
}));
const mockAxios = new MockAdapter(axios);
const workerMock = { postMessage: jest.fn() };
const onErrorMock = jest.fn();
describe('HighlightMixin', () => {
let wrapper;
const hash = '#L50';
const contentArray = Array.from({ length: 140 }, () => 'newline'); // simulate 140 lines of code
const rawTextBlob = contentArray.join('\n');
const languageMock = 'json';
const createComponent = (
{ fileType = TEXT_FILE_TYPE, language = languageMock, externalStorageUrl, rawPath } = {},
isUsingLfs = false,
) => {
const simpleViewer = { fileType };
const dummyComponent = {
mixins: [highlightMixin],
inject: {
highlightWorker: { default: workerMock },
glFeatures: { default: { highlightJsWorker: true } },
},
template: '<div>{{chunks[0]?.highlightedContent}}</div>',
created() {
this.initHighlightWorker(
{ rawTextBlob, simpleViewer, language, fileType, externalStorageUrl, rawPath },
isUsingLfs,
);
},
methods: { onError: onErrorMock },
};
wrapper = shallowMount(dummyComponent, { mocks: { $route: { hash } } });
};
beforeEach(() => createComponent());
describe('initHighlightWorker', () => {
const firstSeventyLines = contentArray.slice(0, LINES_PER_CHUNK).join('\n');
it('generates a chunk for the first 70 lines of raw text', () => {
expect(splitIntoChunks).toHaveBeenCalledWith(languageMock, firstSeventyLines);
});
it('calls postMessage on the worker', () => {
expect(workerMock.postMessage.mock.calls.length).toBe(2);
// first call instructs worker to highlight the first 70 lines
expect(workerMock.postMessage.mock.calls[0][0]).toMatchObject({
content: firstSeventyLines,
language: languageMock,
});
// second call instructs worker to highlight all of the lines
expect(workerMock.postMessage.mock.calls[1][0]).toMatchObject({
content: rawTextBlob,
language: languageMock,
fileType: TEXT_FILE_TYPE,
});
});
});
describe('auto-detects if a language cannot be loaded', () => {
const unknownLanguage = 'some_unknown_language';
beforeEach(() => {
jest.spyOn(Tracking, 'event');
createComponent({ language: unknownLanguage });
});
it('emits a tracking event for the fallback', () => {
const eventData = { label: EVENT_LABEL_FALLBACK, property: unknownLanguage };
expect(Tracking.event).toHaveBeenCalledWith(undefined, EVENT_ACTION, eventData);
});
it('calls the onError method', () => {
expect(onErrorMock).toHaveBeenCalled();
});
});
describe('worker message handling', () => {
const CHUNK_MOCK = { startingFrom: 0, totalLines: 70, highlightedContent: 'some content' };
beforeEach(() => workerMock.onmessage({ data: [CHUNK_MOCK] }));
it('updates the chunks data', () => {
expect(wrapper.text()).toBe(CHUNK_MOCK.highlightedContent);
});
it('highlights hash', () => {
expect(lineHighlighter.highlightHash).toHaveBeenCalledWith(hash);
});
});
describe('LFS blobs', () => {
const rawPath = '/org/project/-/raw/file.xml';
const externalStorageUrl = 'http://127.0.0.1:9000/lfs-objects/91/12/1341234';
const mockParams = { content: rawTextBlob, language: languageMock, fileType: TEXT_FILE_TYPE };
afterEach(() => mockAxios.reset());
it('Uses externalStorageUrl to fetch content if present', async () => {
mockAxios.onGet(externalStorageUrl).replyOnce(HTTP_STATUS_OK, rawTextBlob);
createComponent({ rawPath, externalStorageUrl }, true);
await waitForPromises();
expect(mockAxios.history.get).toHaveLength(1);
expect(mockAxios.history.get[0].url).toBe(externalStorageUrl);
expect(workerMock.postMessage).toHaveBeenCalledWith(mockParams);
});
it('Falls back to rawPath to fetch content', async () => {
mockAxios.onGet(rawPath).replyOnce(HTTP_STATUS_OK, rawTextBlob);
createComponent({ rawPath }, true);
await waitForPromises();
expect(mockAxios.history.get).toHaveLength(1);
expect(mockAxios.history.get[0].url).toBe(rawPath);
expect(workerMock.postMessage).toHaveBeenCalledWith(mockParams);
});
});
});
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