package_description: Welcome! Are you writing JavaScript tests and in the market for a mocking library to fake out real things for you? testdouble.js is an opinionated, carefully-designed test double library maintained by, oddly enough, a software agency that's also named Test Double. (The term "test double" was coined by Gerard Meszaros in his book xUnit Test Patterns.)
package_installation: npm i testdouble