git.scottworley.com Git - inverse-tax/blob - tax.test.js

   1 "use strict";
   2
   3 var assert = require('assert');
   4
   5 function test(description, f) {
   6   f();
   7 }
   8
   9 function near(a, b, epsilon = 1e-6) {
  10   return Math.abs(a - b) < epsilon;
  11 }
  12
  13 test("parse tax table", () => {
  14   const parsed = parse_tax_table(' 1  2\n10  4\n');
  15   assert.strictEqual(parsed.length, 2);
  16   assert.deepStrictEqual(parsed[0], [1, 10, .02]);
  17   assert.deepStrictEqual(parsed[1], [10, Infinity, .04]);
  18 });
  19
  20 test("sum", () => {
  21   assert.strictEqual(sum([]), 0);
  22   assert.strictEqual(sum([7]), 7);
  23   assert.strictEqual(sum([100, 1, 10]), 111);
  24 });
  25
  26 test("tax", () => {
  27   assert.strictEqual(tax([[10, 100, .01], [100, Infinity, .1]], 150), 5.9);
  28   assert.ok(near(tax([[10, 100, .01], [100, Infinity, .1]], 150), 5.9));
  29 });