pocomath/test/_pocomath.mjs
Glen Whitney 880efac15b feat(gcd,lcm): Allow arbitrarily many arguments
And add an 'associate' predicate for two complex numbers to check the results
2022-08-02 10:32:06 -07:00

116 lines
4.2 KiB
JavaScript

import assert from 'assert'
import PocomathInstance from '../src/core/PocomathInstance.mjs'
import math from '../src/pocomath.mjs'
describe('The default full pocomath instance "math"', () => {
it('has no unexpected undefined types', () => {
const undef = math.undefinedTypes()
if (undef.length) {
console.log('NOTE: Found undefined types', undef)
}
assert.strictEqual(undef.length, 1) // Mentioning 'Fraction' but not using
})
it('has a built-in typeOf operator', () => {
assert.strictEqual(math.typeOf(42), 'NumInt')
assert.strictEqual(math.typeOf(-1.5), 'number')
assert.strictEqual(math.typeOf(-42n), 'bigint')
assert.strictEqual(math.typeOf(undefined), 'undefined')
assert.strictEqual(math.typeOf({re: 15n, im: -2n}), 'GaussianInteger')
assert.strictEqual(math.typeOf({re: 6.28, im: 2.72}), 'Complex')
})
it('can subtract numbers', () => {
assert.strictEqual(math.subtract(12, 5), 7)
//assert.strictEqual(math.subtract(3n, 1.5), 1.5)
})
it('can add numbers', () => {
assert.strictEqual(math.add(3, 4), 7)
assert.strictEqual(math.add(1.5, 2.5, 3.5), 7.5)
assert.strictEqual(math.add(Infinity), Infinity)
assert.throws(() => math.add(3n, -1.5), TypeError)
})
it('can negate numbers', () => {
assert.strictEqual(math.negate(-1), 1)
assert.strictEqual(math.add(10, math.negate(3)), 7)
})
it('can be extended', () => {
const stretch = PocomathInstance.merge(math) // clone to not pollute math
stretch.installType('stringK', {
test: s => typeof s === 'string' && s.charAt(0) === 'K',
before: ['string']
})
stretch.install({
add: {
'...stringK': () => addends => addends.reduce((x,y) => x+y, '')
},
})
assert.strictEqual(stretch.add('Kilroy','K is here'), 'KilroyK is here')
})
it('handles complex numbers', () => {
const norm13 = {re: 2, im: 3}
assert.deepStrictEqual(math.complex(2,3), norm13)
assert.deepStrictEqual(math.complex(2), math.complex(2,0))
assert.deepStrictEqual(math.add(2, math.complex(0,3)), norm13)
assert.deepStrictEqual(
math.subtract(math.complex(1,1), math.complex(2,-2)),
math.complex(-1,3))
assert.strictEqual(math.negate(math.complex(3, 8)).im, -8)
assert.deepStrictEqual(
math.subtract(16, math.add(3, math.complex(0,4), 2)),
math.complex(11, -4))
})
it('handles bigints', () => {
assert.strictEqual(math.negate(5n), -5n)
assert.strictEqual(math.subtract(12n, 5n), 7n)
assert.strictEqual(math.add(15n, 25n, 35n), 75n)
assert.strictEqual(math.add(10n, math.negate(3n)), 7n)
})
it('handles Gaussian integers', () => {
const norm13n = {re: 2n, im: 3n}
assert.deepStrictEqual(math.complex(2n,3n), norm13n)
assert.deepStrictEqual(math.complex(2n), math.complex(2n, 0n))
assert.deepStrictEqual(math.add(2n, math.complex(0n, 3n)), norm13n)
assert.deepStrictEqual(
math.subtract(16n, math.add(3n, math.complex(0n,4n), 2n)),
math.complex(11n, -4n))
assert.strictEqual(math.negate(math.complex(3n, 8n)).im, -8n)
})
it('creates chains', () => {
const mychain = math.chain(7).negate()
assert.strictEqual(mychain.value, -7)
mychain.add(23).sqrt().lcm(10)
assert.strictEqual(mychain.value, 20)
assert.strictEqual(math.mean(3,4,5), 4)
assert.throws(() => math.chain(3).mean(4,5), /chain function.*split/)
assert.throws(() => math.chain(3).foo(), /Unknown operation/)
})
it('calls plain factorial function', () => {
assert.strictEqual(math.factorial(4), 24n)
assert.strictEqual(math.factorial(7n), 5040n)
})
it('calculates binomial coefficients', () => {
assert.strictEqual(math.choose(6, 3), 20)
assert.strictEqual(math.choose(21n, 2n), 210n)
})
it('calculates multi-way gcds and lcms', () => {
assert.strictEqual(math.gcd(30,105,42), 3)
assert.ok(
math.associate(
math.lcm(
math.complex(2n,1n), math.complex(1n,1n), math.complex(0n,1n)),
math.complex(1n,3n)))
})
})