In this assignment you will use TDD principles to create a taco stand event emitter and a command$-$line interface program to interact with it$.$ Use the following folder structure for the project: taco$-$stand$-$app src taco$-$stand.js index.js test taco$-$stand.spec.js $84$ package.json

$1.$ In your package.json file, add a test script $($for your unit tests$)$ and a start script $($for the CLI program$).$ Remember to use strict mode in all JavaScript files $($including test files$).$

$2.$ Create a TacoStandEmitter class module that extends the EventEmitter class from Node.js$.$ This class should have the following methods:

a$.$ serveCustomer$($customer: string$)$: Emits a $$serve$$ event with the customer as the actual parameter.

b$.$ prepareTaco$($taco: string$)$: Emits a $$prepare$$ event with the taco as the actual parameter.

c$.$ handleRush$($rush: string$)$: Emits a $$rush$$ event with the rush as the actual parameter.

$3.$ For the class module, write three $(3)$ diKerent unit tests in taco$-$stand$-$spec.js using the Node.js assert library. Each test should register an event listener for the emitted event, call the class method, and print either a pass or fail message to the console.

$4.$ Each test should be wrapped in a function named testFunctionDescription, where functionDescription is a brief description of what the test does. For example, a test for the serveCustomer method could be named testServeCustomer. Below is an example to get you started:

function testPerformAction$()\{$

try $\{$

$//$ register an event listener for the $$action$$ event

$//$ call the perform action method

console.log$($Passed testPerformAction$)$;

return true;

$\}$ catch$($err$)\{$

console.error$(`$Failed testPerformAction: $$\{$err$\}`)$;

return false;

$\}$

$\}$

$5.$ Inside each test function, use a try$-$catch block to run the test and catch any errors. If the test passes, print a message indicating it passed and return true. If the test fails, print a message indicating the test failed and return false. $85$

$6.$ Create a CLI program $($index$.$js$)$ that uses the TacoStandEmitter class. The input format should be command followed by a space and the argument. The commands are $$serve$,$prepare$,$ and $$rush$.$

a$.$ Command $$serve John$$; prints $$Taco Stand serves: John$$

b$.$ Command $$prepare beef$$; prints $$Taco Stand prepares: beef taco$$

c$.$ Command $$rush lunch$$; prints $$Taco Stand handles rush: lunch$$

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