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/* eslint-disable global-require */
import path from 'path';
import axios from '~/lib/utils/axios_utils';
const absPath = path.join.bind(null, __dirname);
jest.mock('fs');
jest.mock('readdir-enhanced');
describe('mocks_helper.js', () => {
let setupManualMocks;
const setMock = jest.fn().mockName('setMock');
let fs;
let readdir;
beforeAll(() => {
jest.resetModules();
jest.setMock = jest.fn().mockName('jest.setMock');
fs = require('fs');
readdir = require('readdir-enhanced');
// We need to provide setupManualMocks with a mock function that pretends to do the setup of
// the mock. This is because we can't mock jest.setMock across files.
setupManualMocks = () => require('./mocks_helper').setupManualMocks(setMock);
});
afterEach(() => {
fs.existsSync.mockReset();
readdir.sync.mockReset();
setMock.mockReset();
});
it('enumerates through mock file roots', () => {
setupManualMocks();
expect(fs.existsSync).toHaveBeenCalledTimes(1);
expect(fs.existsSync).toHaveBeenNthCalledWith(1, absPath('ce'));
expect(readdir.sync).toHaveBeenCalledTimes(0);
});
it("doesn't traverse the directory tree infinitely", () => {
fs.existsSync.mockReturnValue(true);
readdir.sync.mockReturnValue([]);
setupManualMocks();
const readdirSpy = readdir.sync;
expect(readdirSpy).toHaveBeenCalled();
readdirSpy.mock.calls.forEach((call) => {
expect(call[1].deep).toBeLessThan(100);
});
});
it('sets up mocks for CE (the ~/ prefix)', () => {
fs.existsSync.mockImplementation((root) => root.endsWith('ce'));
readdir.sync.mockReturnValue(['root.js', 'lib/utils/util.js']);
setupManualMocks();
expect(readdir.sync).toHaveBeenCalledTimes(1);
expect(readdir.sync.mock.calls[0][0]).toBe(absPath('ce'));
expect(setMock).toHaveBeenCalledTimes(2);
expect(setMock).toHaveBeenNthCalledWith(1, '~/root', './ce/root');
expect(setMock).toHaveBeenNthCalledWith(2, '~/lib/utils/util', './ce/lib/utils/util');
});
it('sets up mocks for all roots', () => {
const files = {
[absPath('ce')]: ['root', 'lib/utils/util'],
[absPath('node')]: ['jquery', '@babel/core'],
};
fs.existsSync.mockReturnValue(true);
readdir.sync.mockImplementation((root) => files[root]);
setupManualMocks();
expect(readdir.sync).toHaveBeenCalledTimes(1);
expect(readdir.sync.mock.calls[0][0]).toBe(absPath('ce'));
expect(setMock).toHaveBeenCalledTimes(2);
expect(setMock).toHaveBeenNthCalledWith(1, '~/root', './ce/root');
expect(setMock).toHaveBeenNthCalledWith(2, '~/lib/utils/util', './ce/lib/utils/util');
});
it('fails when given a virtual mock', () => {
fs.existsSync.mockImplementation((p) => p.endsWith('ce'));
readdir.sync.mockReturnValue(['virtual', 'shouldntBeImported']);
setMock.mockImplementation(() => {
throw new Error('Could not locate module');
});
expect(setupManualMocks).toThrow(
new Error("A manual mock was defined for module ~/virtual, but the module doesn't exist!"),
);
expect(readdir.sync).toHaveBeenCalledTimes(1);
expect(readdir.sync.mock.calls[0][0]).toBe(absPath('ce'));
});
describe('auto-injection', () => {
it('handles ambiguous paths', () => {
jest.isolateModules(() => {
const axios2 = require('../../../app/assets/javascripts/lib/utils/axios_utils').default;
expect(axios2.isMock).toBe(true);
});
});
it('survives jest.isolateModules()', (done) => {
jest.isolateModules(() => {
const axios2 = require('~/lib/utils/axios_utils').default;
expect(axios2.isMock).toBe(true);
done();
});
});
it('can be unmocked and remocked', () => {
jest.dontMock('~/lib/utils/axios_utils');
jest.resetModules();
const axios2 = require('~/lib/utils/axios_utils').default;
expect(axios2).not.toBe(axios);
expect(axios2.isMock).toBeUndefined();
jest.doMock('~/lib/utils/axios_utils');
jest.resetModules();
const axios3 = require('~/lib/utils/axios_utils').default;
expect(axios3).not.toBe(axios2);
expect(axios3.isMock).toBe(true);
});
});
});
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