3
06/11/2024 6:26 pm
Topic starter
Write Mocha tests to check the functionality of the following JS code:
function sum(arr) {
let sum = 0;
for (let i of arr) {
sum += Number(i);
}
return sum;
}
console.log(sum([3, 4, 5, 6, 7]));
Your tests will be supplied a function named 'sum'. It needs to meet the following requirements:
- Takes and array of numbers as argument
- Returns the sum of the values of all elements inside the array
1 Answer
2
06/11/2024 6:31 pm
Here is my solution:
let sum = require('../P04 SumOfNumbers').sum;
let expect = require("chai").expect;
describe('Sum of Numbers tests', () => {
describe('General tests', () => {
it('should be a function', () => {
expect(typeof sum).to.equal('function');
});
});
describe('Function tests', () => {
it('should return zero for a zero length input array', () => {
expect(sum([])).to.equal(0);
});
it('should return the member value for a one member array', () => {
expect(sum([1])).to.equal(1);
});
it('should return the member value for a one member array when given as string', () => {
expect(sum(['1'])).to.equal(1);
});
it('should add whole number arrays', () => {
expect(sum([1,2,3])).to.equal(6);
});
it('should add whole number arrays including negative numbers', () => {
expect(sum([-1,2,3])).to.equal(4);
});
it('should add whole number arrays including strings', () => {
expect(sum([-1,'2',3])).to.equal(4);
});
it('should add fractions', () => {
expect(sum([1.1,2.2,3])).to.be.closeTo(6.3,0.0001);
});
//it('should not add non-arrays', () => {
// expect(sum(1,2,3)).to.be.NaN;
//});
it('should not add arrays of invalid data', () => {
expect(sum(['pesho','gosho'])).to.be.NaN;
});
});
});
