add-zero/test.js

Add a leading zero to a number.

'use strict';

var addZero = require('./');
var test = require('tape');

test('add zero', function(t) {
  t.deepEqual(addZero(5), '05', 'default decimal places should be 2');
  t.deepEqual(addZero(10), '10', 'only add zero if not enough decimal places');
  t.deepEqual(addZero(5, 3), '005', 'test 3 decimal places');
  t.deepEqual(addZero(100, 3), '100', 'test 3 decimal places max digits');
  t.deepEqual(addZero(20, 3), '020', 'test 2 digits number within 3 digit decimal places');
  t.deepEqual(addZero(0), '00', 'test zero value');
  t.deepEqual(addZero(-5), '-05', 'test negative value with default decimal places');
  t.deepEqual(addZero(-10), '-10', 'test negative value when not enough decimal places');
  t.deepEqual(addZero(-5, 3), '-005', 'test negative value with 3 decimal places');
  t.end();
});

test('edge cases', function(t) {
  t.deepEqual(addZero('25', 3), '025', 'should work if value is a string');
  t.deepEqual(addZero(5, 20), '00000000000000000005', 'boring long number should work');
  t.end();
});