@applicaster/zapplicaster-cli/test_helpers/fsMock.js

CLI Tool for the zapp app and Quick Brick project

const fs = jest.genMockFromModule("fs");
const _fs = jest.requireActual("fs");
const R = require("ramda");

function readdirSync(folder) {
  return _fs.readdirSync(folder);
}

function readdir(folder, callback) {
  const files = R.map(R.prop("fileName"), fs.__writenFiles);

  callback(null, files);
}

function writeFile() {
  const callback = R.last(arguments);
  const [fileName, content] = R.init(arguments); // eslint-disable-line no-unused-vars

  const __writtenFiles = {
    fileName,
    content,
  };

  fs.__writenFiles.push(__writtenFiles);
  callback(null, __writtenFiles.content);
}

function getMockedFileContent(fileName) {
  return R.compose(
    R.unless(R.isNil, R.prop("content")),
    R.find(R.propEq("fileName", fileName))
  )(fs.__writenFiles);
}

function readFile(fileName, callback) {
  callback(null, Buffer.from(getMockedFileContent(fileName)));
}

function readFileSync(fileName) {
  return Buffer.from(getMockedFileContent(fileName));
}

function copyFile(_source, _destination, callback) {
  callback(null, { status: "ok" });
}

function copyFileSync() {
  return { status: "ok" };
}

function existsSync(path) {
  return R.includes(path, R.map(R.prop("fileName"), fs.__writenFiles));
}

function statSync(fileName) {
  if (fileName === "not_a_file") {
    const error = new Error("ENOENT: no such file or directory");
    error.code = "ENOENT";
    throw error;
  }

  return {
    isFile: () => true,
  };
}

function __addMockedFiles(fileName, content) {
  try {
    const json = JSON.stringify(content);
    fs.__writenFiles.push({ fileName, content: json });
  } catch (e) {
    fs.__writenFiles.push({ fileName, content });
  }
}

function __resetFiles() {
  fs.__writenFiles = [];
}

fs.__writenFiles = [];
fs.__resetFiles = __resetFiles;
fs.__addMockedFiles = __addMockedFiles;
fs.readdirSync = readdirSync;
fs.readdir = jest.fn(readdir);
fs.writeFile = jest.fn(writeFile);
fs.readFile = jest.fn(readFile);
fs.readFileSync = jest.fn(readFileSync);
fs.copyFile = jest.fn(copyFile);
fs.copyFileSync = jest.fn(copyFileSync);
fs.existsSync = jest.fn(existsSync);
fs.statSync = jest.fn(statSync);

module.exports = fs;