In this assignment, you will create a module that simulates a simple pie baker. You will use TDD principles and Jest for unit testing. Instructions

$1.$ Create a new folder for your project. Name it pie$-$baker

$2.$ Inside the pie$-$backer folder create two subfolders: src and test

$3.$ Inside the test folder, create a file named pie.spec.js

$4.$ In the pie.js file, you will write a function named bakePie that takes a type of pie and an array of ingredients. The function should return a message indicating whether the pie was successfully baked or not. If an essential ingredient is missing, the function should log a warning message and call process.exit$(1).$ a$.$ The essential ingredients are: flour, sugar, and butter.

$5.$ In the pie.spec.js file, you will write unit tests for the bakePie function. You should write at least three tests.

$6.$ In your package.json file, add a test script that runs jest.

$7.$ Use TDD principles to guide your development process. Write your tests first, then write the code to make the tests pass, then refactor $($Red $$ Green $$ Refactor$).$

Hints

$$ Remember to use module.exports to export your function from pie.js and require to import it into pie.spec.js

$$ Use jest.fn$()$ to create mock functions in your tests. Follow the format used in the plant$-$checker program.

$$ Use toBe or toEqual for your assertions.

$$ Remember to call your functions in each test with the necessary arguments.

$$ Use npm install $--$save$-$dev to install jest.

$$ Use npm test to run your tests.

$$ If you are testing a function that calls process.exit, be aware that this will terminate the Node.js process immediately. This means, that any unit tests following a check to process.exit will not be executed and will fail. Structure your unit tests in a way that the test to check process.exit is the last one in the test suite list. For example, unit test $1($condition that does not call process.exit$),$ unit test $2($condition that does not call process.exit$),$ unit test $3($condition that does call process.exit$).```$

Js pie.js

src $>$ JS pie.js $>...$

$1\backslash **$

Author:

$*$ Date:

$*$ File Name:

$*$ Description:

$*/$

"use strict";

function bakePie$($pieType$,$ ingredients$)\{$

$|//$ Your code here

$\}$

mogdule.exports $=\{$ bakePie $\}$;

$``````$

test $>$ JS pie.spec.js $>...$

$1/**$

$*$ Author:

$*$ Date:

$*$ File Name:

$*$ Description:

$*/$

"use strict";

const $\{$ bakePie $\}=$ r$...$quire$("../$src$/$pie$")$;

$//$ Your tests here

$``````$

Js pie.js

$\{\}$ package.json $\backslash$

$\{\}$ package.json $>...$

$1\{$

"name": "pie$-$baker",

"version": $"1\mathrm{.}0\mathrm{.}0",$

"description": $"",$

"main": "index.js$",$

"directories": $\{$

"test": "test"

$\},$

$\backslash$ Debug

"scripts": $\{$

"test": "echo $\backslash "$Error: no test specified$\backslash "$ && exit $1"$

$\},$

"keywords": $[],$

"author": $"",$

"license": "ISC"

$\}$

$```$