/
fs.js
27 lines (22 loc) · 872 Bytes
/
fs.js
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const fs = jest.genMockFromModule('fs');
// This is a custom function that our tests can use during setup to specify
// what the files on the "mock" filesystem should look like when any of the
// `fs` APIs are used.
let mockFiles = Object.create(null);
// eslint-disable-next-line no-underscore-dangle
function __setMockFiles(newMockFiles) {
mockFiles = newMockFiles;
}
// A custom version of `readdirSync` that reads from the special mocked out
// file list set via __setMockFiles
const readFileSync = (filePath = '') => mockFiles[filePath];
const existsSync = filePath => !!mockFiles[filePath];
const lstatSync = filePath => ({
isFile: () => !!mockFiles[filePath],
});
// eslint-disable-next-line no-underscore-dangle
fs.__setMockFiles = __setMockFiles;
fs.readFileSync = readFileSync;
fs.existsSync = existsSync;
fs.lstatSync = lstatSync;
module.exports = fs;