test.js

const assert = require('assert')
const { part1, part2, evaluateExpression } = require('./script')

const homework = 
`1 + 2 * 3 + 4 * 5 + 6
1 + (2 * 3) + (4 * (5 + 6))
2 * 3 + (4 * 5)
5 + (8 * 3 + 9 + 3 * 4 * 3)
5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4))
((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2`

describe('Day 18: Operation Order', () => {
    describe('evaluateExpressionLeftToRight', () => {
        it('should evaluate an expression from left to right', () => {
            assert.strictEqual(evaluateExpression('1 + 2 * 3 + 4 * 5 + 6'), 71)
            assert.strictEqual(evaluateExpression('5 + (8 * 3 + 9 + 3 * 4 * 3)'), 437)
            assert.strictEqual(evaluateExpression('((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2'), 13632)
        })
    })
    describe('Part One', () => {
        it('should evaluate the expression on each line of homework and provide the sum of the resulting values', () => {
            assert.strictEqual(part1(homework), 26457)
        })
    })

    describe('evaluateAdditionsFirst', () => {
        it('should perform additions first', () => {
            assert.strictEqual(evaluateExpression('1 + 2 * 3 + 4 * 5 + 6', true), 231)
            assert.strictEqual(evaluateExpression('1 + (2 * 3) + (4 * (5 + 6))', true), 51)
            assert.strictEqual(evaluateExpression('2 * 3 + (4 * 5)', true), 46)
        })
    })
    describe('Part Two', () => {
        it('should evaluate the expression on each line of homework and provide the sum of the resulting values (addition taking precedence)', () => {
            assert.strictEqual(part2(homework), 694173)
        })
    })
})