How to replace the result of calling a standard node.js module in tests?

Question

JavaScript

The application uses child_process.exec(). Is it possible somehow to slip the prepared result exec()into the tests? something like mock. After all, CI does not have the program that I want to execute.

Answer 1

const child_process = {};
child_process.exec = function () {
  // Все что угодно
}

If CP is used not in the test, but in the lib itself, then you can somehow pervert with the transfer of child_process as a parameter, then you can slip any functions instead of it.