Test migration to jest by hand

Apparently using regular expressions is way easier.

test/round/round.js

@@ -0,0 +1,2 @@
+const round = (n, decimals = 0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);
+module.exports = round;

test/round/round.test.js

@@ -0,0 +1,35 @@
+const expect = require('expect');
+const round = require('./round.js');
+
+
+  test('round is a Function', () => {
+  expect(round).toBeInstanceOf(Function);
+});
+  t.equal(round(1.005, 2), 1.01, "round(1.005, 2) returns 1.01");
+  t.equal(round(123.3423345345345345344, 11), 123.34233453453, "round(123.3423345345345345344, 11) returns 123.34233453453");
+  t.equal(round(3.342, 11), 3.342, "round(3.342, 11) returns 3.342");
+  t.equal(round(1.005), 1, "round(1.005) returns 1");
+  test('round([1.005, 2]) returns NaN', () => {
+  expect(isNaN(round([1.005, 2]))).toBeTruthy();
+});
+  test('round(string) returns NaN', () => {
+  expect(isNaN(round('string'))).toBeTruthy();
+});
+  test('round() returns NaN', () => {
+  expect(isNaN(round())).toBeTruthy();
+});
+  test('round(132, 413, 4134) returns NaN', () => {
+  expect(isNaN(round(132, 413, 4134))).toBeTruthy();
+});
+  test('round({a: 132}, 413) returns NaN', () => {
+  expect(isNaN(round({a: 132}, 413))).toBeTruthy();
+});
+
+  let start = new Date().getTime();
+  round(123.3423345345345345344, 11);
+  let end = new Date().getTime();
+  test('round(123.3423345345345345344, 11) takes less than 2s to run', () => {
+  expect((end - start) < 2000).toBeTruthy();
+});
+  
+