nanomath/src/number/__test__/arithmetic.spec.js

import assert from 'assert'
import math from '#nanomath'
import {ReturnTyping} from '#core/Type.js'

describe('number arithmetic', () => {
   it('supports basic operations', () => {
      assert.strictEqual(math.abs(-Infinity), Infinity)
      assert.strictEqual(math.absquare(-2), 4)
      assert.strictEqual(math.add(2, 2), 4)
      assert.strictEqual(math.divide(6, 4), 1.5)
      assert.strictEqual(math.cbrt(-8), -2)
      assert.strictEqual(math.invert(-4), -0.25)
      assert.strictEqual(math.multiply(4, 1.5), 6)
      assert.strictEqual(math.negate(Infinity), -Infinity)
      assert.strictEqual(math.subtract(4, 2), 2)
      assert.strictEqual(math.quotient(7, 3), 2)
   })
   it('takes square root of numbers appropriately', () => {
      assert(isNaN(math.sqrt(NaN)))
      assert.strictEqual(math.sqrt(4), 2)
      assert.deepStrictEqual(math.sqrt(-4), math.complex(0, 2))
      math.config.returnTyping = ReturnTyping.conservative
      assert(isNaN(math.sqrt(NaN)))
      assert.strictEqual(math.sqrt(4), 2)
      assert(isNaN(math.sqrt(-4)))
      math.config.returnTyping = ReturnTyping.full
      assert(isNaN(math.sqrt(NaN)))
      assert.deepStrictEqual(math.sqrt(4), math.complex(2, 0))
      assert.deepStrictEqual(math.sqrt(-4), math.complex(0, 2))
      math.config.returnTyping = ReturnTyping.free
   })
})