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/**
* @module
*
* This module implements auto-injected manual mocks that are cleaner than Jest's approach.
*
* See https://docs.gitlab.com/ee/development/testing_guide/frontend_testing.html
*/
import fs from 'fs';
import path from 'path';
import readdir from 'readdir-enhanced';
const MAX_DEPTH = 20;
const prefixMap = [
// E.g. the mock ce/foo/bar maps to require path ~/foo/bar
{ mocksRoot: 'ce', requirePrefix: '~' },
// { mocksRoot: 'ee', requirePrefix: 'ee' }, // We'll deal with EE-specific mocks later
// { mocksRoot: 'virtual', requirePrefix: '' }, // We'll deal with virtual mocks later
];
const mockFileFilter = (stats) => stats.isFile() && stats.path.endsWith('.js');
const getMockFiles = (root) => readdir.sync(root, { deep: MAX_DEPTH, filter: mockFileFilter });
// Function that performs setting a mock. This has to be overridden by the unit test, because
// jest.setMock can't be overwritten across files.
// Use require() because jest.setMock expects the CommonJS exports object
const defaultSetMock = (srcPath, mockPath) =>
jest.mock(srcPath, () => jest.requireActual(mockPath));
export const setupManualMocks = function setupManualMocks(setMock = defaultSetMock) {
prefixMap.forEach(({ mocksRoot, requirePrefix }) => {
const mocksRootAbsolute = path.join(__dirname, mocksRoot);
if (!fs.existsSync(mocksRootAbsolute)) {
return;
}
getMockFiles(path.join(__dirname, mocksRoot)).forEach((mockPath) => {
const mockPathNoExt = mockPath.substring(0, mockPath.length - path.extname(mockPath).length);
const sourcePath = path.join(requirePrefix, mockPathNoExt);
const mockPathRelative = `./${path.join(mocksRoot, mockPathNoExt)}`;
try {
setMock(sourcePath, mockPathRelative);
} catch (e) {
if (e.message.includes('Could not locate module')) {
// The corresponding mocked module doesn't exist. Raise a better error.
// Eventualy, we may support virtual mocks (mocks whose path doesn't directly correspond
// to a module, like with the `ee_else_ce` prefix).
throw new Error(
`A manual mock was defined for module ${sourcePath}, but the module doesn't exist!`,
);
}
}
});
});
};
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