Binary package “node-mock-fs” in ubuntu focal

configurable mock for Node.js module fs

 The "mock-fs" module allows Node's built-in "fs" module
 to be backed temporarily by an in-memory, mock file system.
 This lets you run tests against a set of mock files and directories
 instead of lugging around a bunch of test fixtures.
 .
 Node.js is an event-based server-side JavaScript engine.