dummy-shells

Dummy versions of shelljs for testing.

- dummyShellJs: Commands do nothing. Can query dummyShellJs.execList for calls to shelljs.exec, etc.
- dryRunShellJs: Exec and other commands will print to console.
- failingShellJs: Exec and other commands will return 1 for failure.

Using jest.mock

If you don't want to use dummyShellJs you can mock it like so:

beforeEach(() => {
jest.mock("shelljs", () => {
return {
exec: jest.fn(() => ({ code: 0 })),
echo: jest.fn(),
}
})
shelljs = require("shelljs");