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Commit | Line | Data |
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0993d859 SW |
1 | "use strict"; |
2 | ||
3 | var assert = require('assert'); | |
4 | ||
5 | function test(description, f) { | |
6 | f(); | |
7 | } | |
8 | ||
0993d859 SW |
9 | test("parse tax table", () => { |
10 | const parsed = parse_tax_table(' 1 2\n10 4\n'); | |
11 | assert.strictEqual(parsed.length, 2); | |
12 | assert.deepStrictEqual(parsed[0], [1, 10, .02]); | |
13 | assert.deepStrictEqual(parsed[1], [10, Infinity, .04]); | |
14 | }); | |
15 | ||
16 | test("sum", () => { | |
17 | assert.strictEqual(sum([]), 0); | |
18 | assert.strictEqual(sum([7]), 7); | |
19 | assert.strictEqual(sum([100, 1, 10]), 111); | |
20 | }); | |
21 | ||
22 | test("tax", () => { | |
23 | assert.strictEqual(tax([[10, 100, .01], [100, Infinity, .1]], 150), 5.9); | |
0993d859 | 24 | }); |
26460571 SW |
25 | |
26 | test("merge tax tables", () => { | |
27 | function rand(limit = 100) { | |
28 | return Math.round(Math.random() * limit); | |
29 | } | |
30 | function make_random_tax_table(min_threshold) { | |
31 | if (rand(2)) return []; | |
32 | const start = min_threshold === undefined ? rand() : min_threshold; | |
33 | const end = start + 1 + rand(); | |
34 | return [[start, end, rand()]].concat(make_random_tax_table(end)); | |
35 | } | |
36 | for (var i = 0; i < 1000; i++) { | |
37 | const t1 = make_random_tax_table(); | |
38 | const t2 = make_random_tax_table(); | |
39 | const combined = merge_tax_tables(t1, t2); | |
40 | for (var j = 0; j < 10; j++) { | |
41 | const income = rand(250); | |
42 | assert.strictEqual(tax(t1, income) + tax(t2, income), tax(combined, income)); | |
43 | } | |
44 | } | |
45 | }); |