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[inverse-tax] / tax.test.js

"use strict";

var assert = require('assert');

function test(description, f) {
  f();
}

function near(a, b, epsilon = 1e-6) {
  return Math.abs(a - b) < epsilon;
}

test("parse tax table", () => {
  const parsed = parse_tax_table(' 1  2\n10  4\n');
  assert.strictEqual(parsed.length, 2);
  assert.deepStrictEqual(parsed[0], [1, 10, .02]);
  assert.deepStrictEqual(parsed[1], [10, Infinity, .04]);
});

test("sum", () => {
  assert.strictEqual(sum([]), 0);
  assert.strictEqual(sum([7]), 7);
  assert.strictEqual(sum([100, 1, 10]), 111);
});

test("tax", () => {
  assert.strictEqual(tax([[10, 100, .01], [100, Infinity, .1]], 150), 5.9);
  assert.ok(near(tax([[10, 100, .01], [100, Infinity, .1]], 150), 5.9));
});