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78 lines
2.7 KiB
JavaScript
78 lines
2.7 KiB
JavaScript
var assert = require('assert'),
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approx = require('../../../tools/approx'),
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math = require('../../../index'),
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Unit = math.type.Unit,
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Matrix = math.type.Matrix,
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unit = math.unit;
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describe('to', function() {
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it('should perform the given unit conversion', function() {
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var a = math.unit('500 cm'); a.fixPrefix = true;
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approx.deepEqual(math.to(unit('5m'), unit('cm')), a);
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var b = math.unit('1 foot'); b.fixPrefix = true;
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approx.deepEqual(math.to(unit('12 inch'), unit('foot')), b);
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var c = math.unit('1 inch'); c.fixPrefix = true;
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approx.deepEqual(math.to(unit('2.54 cm'), unit('inch')), c);
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var d = math.unit('68 fahrenheit'); d.fixPrefix = true;
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approx.deepEqual(math.to(unit('20 celsius'), unit('fahrenheit')), d);
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var e = math.unit('0.002 m3'); e.fixPrefix = true;
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approx.deepEqual(math.to(unit('2 litre'), unit('m3')), e);
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});
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it('should perform the given unit conversion on each element of an array', function() {
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approx.deepEqual(math.to([
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unit('1cm'),
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unit('2 inch'),
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unit('2km')
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], unit('foot')), [
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new Unit(0.032808, 'foot').to('foot'),
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new Unit(0.16667, 'foot').to('foot'),
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new Unit(6561.7, 'foot').to('foot')
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]);
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});
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it('should perform the given unit conversion on each element of a matrix', function() {
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var a = math.matrix([
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[unit('1cm'), unit('2cm')],
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[unit('3cm'),unit('4cm')]
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]);
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var b = math.to(a, unit('mm'));
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assert.ok(b instanceof math.type.Matrix);
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approx.deepEqual(b, math.matrix([
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[new Unit(10, 'mm').to('mm'), new Unit(20, 'mm').to('mm')],
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[new Unit(30, 'mm').to('mm'), new Unit(40, 'mm').to('mm')]
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]));
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});
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it('should throw an error if converting between incompatible units', function() {
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assert.throws(function () {math.to(unit('20 kg'), unit('cm'))});
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assert.throws(function () {math.to(unit('20 celsius'), unit('litre'))});
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assert.throws(function () {math.to(unit('5 cm'), unit('2 m'))});
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});
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it('should throw an error if called with a wrong number of arguments', function() {
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assert.throws(function () {math.to(unit('20 kg'))});
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assert.throws(function () {math.to(unit('20 kg'), unit('m'), unit('cm'))});
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});
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it('should throw an error if called with a non-plain unit', function() {
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assert.throws( function () {math.unit(5000, 'cm').to('5mm'); });
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});
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it('should throw an error if called with a number', function() {
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assert.throws(function () {math.to(5, unit('m'))}, TypeError);
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assert.throws(function () {math.to(unit('5cm'), 2)}, TypeError);
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});
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it('should throw an error if called with a string', function() {
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assert.throws(function () {math.to('5cm', unit('cm'))}, TypeError);
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});
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}); |