CODE EXAMPLE FOR JAVASCRIPT

Cannot find module jest

For those who are facing this issue in 2022. Please add this code in your 
`jest-unit.json (or your jest config json file)`.

    "moduleDirectories": ["<rootDir>/../", "node_modules"]

Result:

    {
      "moduleFileExtensions": ["js", "json", "ts"],
      "rootDir": ".",
      "testEnvironment": "node",
      "testRegex": "..spec.ts$",
      "transform": {
        "^.+.(t|j)s$": "ts-jest"
      },
      "moduleDirectories": ["<rootDir>/../", "node_modules"]
    }