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63 lines
2.2 KiB
JavaScript
63 lines
2.2 KiB
JavaScript
var assert = require('assert'),
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error = require('../../../lib/error/index'),
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math = require('../../../index'),
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approx = require('../../../tools/approx'),
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pi = math.pi,
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complex = math.complex,
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matrix = math.matrix,
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unit = math.unit,
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cosh = math.cosh;
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describe('cosh', function() {
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it('should return the cosh of a boolean', function () {
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approx.equal(cosh(true), 1.5430806348152);
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approx.equal(cosh(false), 1);
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});
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it('should return the cosh of a number', function() {
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approx.equal(cosh(0), 1);
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approx.equal(cosh(pi), 11.591953275522);
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approx.equal(cosh(1), 1.5430806348152);
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approx.equal(cosh(2), 3.7621956910836);
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approx.equal(cosh(3), 10.067661995778);
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});
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it('should return the cosh of a bignumber (downgrades to number)', function() {
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approx.equal(cosh(math.bignumber(1)), 1.5430806348152);
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});
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it('should return the cosh of a complex number', function() {
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approx.deepEqual(cosh(complex('1')), complex(1.5430806348152, 0));
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approx.deepEqual(cosh(complex('i')), complex(0.54030230586814, 0));
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approx.deepEqual(cosh(complex('2 + i')), complex(2.0327230070197, 3.0518977991518));
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});
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it('should return the cosh of an angle', function() {
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approx.equal(cosh(unit('90deg')), 2.5091784786581);
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approx.equal(cosh(unit('-45deg')), 1.324609089252);
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});
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it('should throw an error if called with an invalid unit', function() {
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assert.throws(function () {cosh(unit('5 celsius'))});
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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 () {cosh('string')});
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});
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var cosh123 = [1.5430806348152, 3.7621956910836, 10.067661995778];
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it('should return the cosh of each element of an array', function() {
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approx.deepEqual(cosh([1,2,3]), cosh123);
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});
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it('should return the cosh of each element of a matrix', function() {
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approx.deepEqual(cosh(matrix([1,2,3])), matrix(cosh123));
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});
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it('should throw an error in case of invalid number of arguments', function() {
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assert.throws(function () {cosh()}, error.ArgumentsError);
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assert.throws(function () {cosh(1, 2)}, error.ArgumentsError);
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});
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});
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