short-number/test.js

Turn a long number into a short one to improve readability, like 23634 => 23.6K

'use strict';
var test = require('tape');
var shortNumber = require('./');

test('positive tests', function(t) {
    t.plan(17);

    t.equal(shortNumber(231), 231);
    t.equal(shortNumber(231.6), 231.6);
    t.equal(shortNumber(1000), '1K');
    t.equal(shortNumber(5432), '5.4K');
    t.equal(shortNumber(5432.8567), '5.4K');
    t.equal(shortNumber(35656), '35.7K');
    t.equal(shortNumber(1000000), '1M');
    t.equal(shortNumber(1000000.89), '1M');
    t.equal(shortNumber(1236903), '1.2M');
    t.equal(shortNumber(49653234), '49.7M');
    t.equal(shortNumber(984938293), '984.9M');
    t.equal(shortNumber(1000000000), '1B');
    t.equal(shortNumber(2743000000), '2.7B');
    t.equal(shortNumber(64743000000), '64.7B');
    t.equal(shortNumber(344843000000), '344.8B');
    t.equal(shortNumber(1000000000000), '1T');
    t.equal(shortNumber(1344843000000), '1.3T');
});

test('negative tests', function(t) {
    t.plan(17);

    t.equal(shortNumber(-231), -231);
    t.equal(shortNumber(-231.6), -231.6);
    t.equal(shortNumber(-1000), '-1K');
    t.equal(shortNumber(-5432), '-5.4K');
    t.equal(shortNumber(-5432.8567), '-5.4K');
    t.equal(shortNumber(-35656), '-35.7K');
    t.equal(shortNumber(-1000000), '-1M');
    t.equal(shortNumber(-1000000.89), '-1M');
    t.equal(shortNumber(-1236903), '-1.2M');
    t.equal(shortNumber(-49653234), '-49.7M');
    t.equal(shortNumber(-984938293), '-984.9M');
    t.equal(shortNumber(-1000000000), '-1B');
    t.equal(shortNumber(-2743000000), '-2.7B');
    t.equal(shortNumber(-64743000000), '-64.7B');
    t.equal(shortNumber(-344843000000), '-344.8B');
    t.equal(shortNumber(-1000000000000), '-1T');
    t.equal(shortNumber(-1344843000000), '-1.3T');
});

test('throw error on too large numbers', function(t) {
    t.plan(1);

    t.throws(function() {
        shortNumber(1e20);
    }, RangeError, 'Input expected to be < 1e19');
});

test('throw error on too small numbers', function(t) {
    t.plan(1);

    t.throws(function() {
        shortNumber(-1e20);
    }, RangeError, 'Input expected to be > -1e19');
});

test('throw error on incorrect type', function(t) {
    t.plan(4);

    t.throws(function() {
        shortNumber('abc');
    }, TypeError, 'Expected a number');

    t.throws(function() {
        shortNumber(true);
    }, TypeError, 'Expected a number');

    t.throws(function() {
        shortNumber([]);
    }, TypeError, 'Expected a number');

    t.throws(function() {
        shortNumber({});
    }, TypeError, 'Expected a number');
});