Function mockReadFileSync

packages/airnode-node/test/mock-utils.ts:122–130

(filePathSubstr: string, mockValue: string)

 * and otherwise returns the original content.
 */
export const mockReadFileSync = (filePathSubstr: string, mockValue: string) => {
  return jest.spyOn(fs, 'readFileSync').mockImplementation((...args) => {
    const path = args[0].toString();
    if (path.includes(filePathSubstr)) {
      return mockValue;
    }
    return originalFs(...args);
  });
};