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95 lines
4.0 KiB
JavaScript
95 lines
4.0 KiB
JavaScript
// test round
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var assert = require('assert'),
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approx = require('../../../tools/approx'),
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error = require('../../../lib/error/index'),
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math = require('../../../index'),
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bignumber = math.bignumber,
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round = math.round;
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describe('round', function() {
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it('should round a number to te given number of decimals', function() {
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approx.equal(round(math.pi), 3);
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approx.equal(round(math.pi * 1000), 3142);
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approx.equal(round(math.pi, 3), 3.142);
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approx.equal(round(math.pi, 6), 3.141593);
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approx.equal(round(1234.5678, 2), 1234.57);
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});
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it('should round booleans (yeah, not really useful but it should be supported)', function() {
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approx.equal(round(true), 1);
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approx.equal(round(false), 0);
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approx.equal(round(true, 2), 1);
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approx.equal(round(false, 2), 0);
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});
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it('should round null', function () {
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assert.equal(round(null), 0);
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assert.equal(round(null, 2), 0);
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});
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it('should throw an error on invalid type of value', function() {
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assert.throws(function () {round('string');}, TypeError);
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assert.throws(function () {round(new Date());}, TypeError);
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});
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it('should throw an error on invalid type of n', function() {
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assert.throws(function () {round(math.pi, new Date());}, TypeError);
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});
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it('should throw an error on invalid value of n', function() {
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assert.throws(function () {round(math.pi, -2);}, /Number of decimals in function round must be in te range of 0-15/);
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assert.throws(function () {round(math.pi, 20);}, /Number of decimals in function round must be in te range of 0-15/);
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assert.throws(function () {round(math.pi, 2.5);}, /Number of decimals in function round must be an integer/);
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});
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it('should throw an error if used with wrong number of arguments', function() {
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assert.throws(function () {round();}, error.ArgumentsError);
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assert.throws(function () {round(1,2,3);}, error.ArgumentsError);
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});
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it('should round bignumbers', function() {
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assert.deepEqual(round(bignumber(2.7)), bignumber(3));
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assert.deepEqual(round(bignumber(2.1)), bignumber(2));
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assert.deepEqual(round(bignumber(2.123456), bignumber(3)), bignumber(2.123));
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assert.deepEqual(round(bignumber(2.123456), 3), bignumber(2.123));
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assert.deepEqual(round(2.1234567, bignumber(3)), 2.123);
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assert.deepEqual(round(true, bignumber(3)), 1);
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assert.deepEqual(round(bignumber(1.23), true), bignumber(1.2));
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});
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it('should round real and imag part of a complex number', function() {
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assert.deepEqual(round(math.complex(2.2, math.pi)), math.complex(2,3));
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});
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it('should round a complex number with a bignumber as number of decimals', function() {
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assert.deepEqual(round(math.complex(2.157, math.pi), bignumber(2)), math.complex(2.16, 3.14));
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});
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it('should throw an error if used with a unit', function() {
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assert.throws(function () { round(math.unit('5cm')); }, TypeError, 'Function round(unit) not supported');
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assert.throws(function () { round(math.unit('5cm'), 2); }, TypeError, 'Function round(unit) not supported');
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assert.throws(function () { round(math.unit('5cm'), bignumber(2)); }, TypeError, 'Function round(unit) not supported');
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});
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it('should throw an error if used with a string', function() {
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assert.throws(function () { round("hello world"); }, TypeError, 'Function round(unit) not supported');
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});
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it('should round each element in a matrix, array, range', function() {
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assert.deepEqual(round(math.range(0,2.1,1/3), 2), math.matrix([0,0.33,0.67,1,1.33,1.67,2]));
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assert.deepEqual(round(math.range(0,2.1,1/3)), math.matrix([0,0,1,1,1,2,2]));
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assert.deepEqual(round([1.7,2.3]), [2,2]);
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assert.deepEqual(round(math.matrix([1.7,2.3])).valueOf(), [2, 2]);
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});
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it('should LaTeX round', function () {
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var expr1 = math.parse('round(1.1)');
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var expr2 = math.parse('round(1.1,2)');
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assert.equal(expr1.toTex(), '\\left\\lfloor{1.1}\\right\\rceil');
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assert.equal(expr2.toTex(), '\\mathrm{round}\\left({1.1},{2}\\right)');
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});
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});
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