Welcome to the Interplanetary Science Fair! In this assignment, you will be creating a module that calculates the distance between two planets in our solar system. You will be using Test Driven Development $($TDD$)$ principles and the Node.js assert library to guide your development process. For this assignment, we will be using Astronomical Units $($AU$)$ to measure distances. $1$ AU is the average distance between the Sun to the Earth. You will need to research and find the approximate distance of the planets from the Sun in AU$.$ Remember, these are average values, as the actual distances vary as the planets orbit the Sun. Instructions:

$1.$ Create a new folder for your project following this structure:

distance$-$calculator

src

distance$-$calculator.js

test

distance$-$calculator.spec.js

package.json

$2.$ In your package.json file, add a test script. Remember to use strict mode. $3.$ Your distance$-$calculator.js module should include a function that calculates the distance between two planets in AU$,$ given their distances from the sun in AU$.$

$4.$ For the function in your module, write three $(3)$ diKerent unit tests in the distancecalculator.spec.js using the Node.js assert library. Each test should set up a scenario, call the function with specific inputs, and then assert that the function$$s output is correct.

$5.$ 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 that checks if the function correctly calculates the distance between Earth and Mars could be named testEarthToMars.

$6.$ 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. Below is an example to get you started:

function testEarthToMars$()\{$

try $\{$

assert.strictEqual$($calculateDistance$(\text{'}$Earth$\text{'},$ 'Mars'$),$ expectedValue$)$;

return true;

$\}$ catch $($error$)\{$

console.error$(`$Failed testEarthToMars: $$\{$error$.$message$\}`)$;

return false; $\}\}$

$7.$ Use TDD principles to guide your development process. Write your tests first, then write the code to make the tests pass.

Grading: You will be awarded $20$ points for each passing unit test, for a total of $60$ points. If a test does not pass, you will not receive points for that test. Use the provide starter files to complete the assignment. $```$

JS distance$-$calculator.js

JS distance$-$calculator.js $>$ calculateDistance

$1$ function calculateDistance$($planet$1,$ planet$2)\{$

$//$ TODO: Implement this function

$\}$

module.exports $=$ calculateDistance;

$``````$

JS distance$-$calculator.spec.js $$

JS distance$-$calculator.spec.js $>...$

$1$ const assert $=$ require$(\text{'}$assert$\text{'})$;

const calculateDistance $=$ require$(\text{'}../$src$/$distance$-$calculator'$)$;

function testFunctionDescription$()\{$

$//$ TODOF Implement this function

$\}$

$//$ Call your test functions here

$```$