Optimizing Mocha Chai testing of a simple JavaScript application - mocha.js

Question

I am tasked with testing this index.js file using Mocha Chai Testing:
module.exports = {
addDetails: function() {
let data =[]
data.push("one");
return data
},
deleteDetails: function() {
let data =["one" , "two"]
data.splice(0 , 1)
return data
},
editDetails: function() {
let data =["one"]
data.splice(0 , 1 , "three")
return data
},
updateDetails: function() {
let data = ["one" , "three"]
data.splice(1 , 0 , "two")
return data
},
detailsPop: function() {
let numb = ["one" , "two"]
numb.pop()
return numb
},
concatData: function() {
let data1 = ["one"]
let data2 = ["two"]
let result = data1.concat(data2)
return result
}
}
I am using this virtual environment as my work environment (HackerRank):
Here is the indextest.js file I wrote testing each of the functions in index.js:
var assert = require("assert");
var crud = require('../src/index');
describe('Crud application', function(){
//write your code here
it("testing addDetails", function() {
assert.equal(crud.addDetails(), [ 'one' ], 'addDetails works!');
});
it("testing deleteDetails", function() {
assert.equal(crud.deleteDetails(), [ 'two' ], 'deleteDetails works!');
});
it("testing editDetails", function() {
assert.equal(crud.editDetails(), [ 'three' ], 'editDetails works!');
});
it("testing updateDetails", function() {
assert.equal(crud.updateDetails(), [ 'one', 'two', 'three' ], 'updateDetails works!');
});
it("testing detailsPop", function() {
assert.equal(crud.detailsPop(), [ 'one' ], 'detailsPop works!');
});
it("testing concatData", function() {
assert.equal(crud.concatData(), [ 'one', 'two' ], 'concatData works!');
});
});
My test performance is being scored using score.sh
npm install
npx nyc mocha --timeout 10000 --reporter mocha-junit-reporter --exit
npx nyc --reporter=clover mocha --timeout 10000 --reporter mocha-junit-reporter --exit
node xml-merge.js
My indextest.js is not accepted by score.sh. Here is my console:
user#workspaceew8g7c7x4yebmr8m:/projects/challenge$ npm test
js_crud#1.0.0 test /projects/challenge
mocha --timeout 10000 --reporter mocha-junit-reporter --collectCoverageFrom=src/index.js --exit
npm ERR! Test failed. See above for more details.
user#workspaceew8g7c7x4yebmr8m:/projects/challenge$
What is a better way to test using Mocha Chai? How could I change my indextest.js file to provide better testing for my index.js?