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https://github.com/josdejong/mathjs.git
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89 lines
3.3 KiB
JavaScript
89 lines
3.3 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/defaultInstance.js'
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import { approxEqual, approxDeepEqual } from '../../../../tools/approx.js'
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const pi = math.pi
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const complex = math.complex
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const matrix = math.matrix
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const unit = math.unit
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const cosh = math.cosh
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const bigmath = math.create({ number: 'BigNumber', precision: 20 })
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describe('cosh', function () {
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it('should return the cosh of a boolean', function () {
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approxEqual(cosh(true), 1.5430806348152)
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approxEqual(cosh(false), 1)
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})
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it('should return the cosh of a number', function () {
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approxEqual(cosh(0), 1)
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approxEqual(cosh(pi), 11.591953275522)
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approxEqual(cosh(1), 1.5430806348152)
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approxEqual(cosh(2), 3.7621956910836)
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approxEqual(cosh(3), 10.067661995778)
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})
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it('should return the cosh of a bignumber', function () {
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const coshBig = bigmath.cosh
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const Big = bigmath.bignumber
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const arg1 = Big(-3)
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const arg9 = Big(Infinity)
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const arg10 = Big(-Infinity)
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assert.deepStrictEqual(coshBig(arg1), Big('10.067661995777765842'))
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assert.deepStrictEqual(coshBig(Big(-2)), Big('3.7621956910836314596'))
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assert.deepStrictEqual(coshBig(Big(-1)), Big('1.5430806348152437785'))
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assert.deepStrictEqual(coshBig(Big(0)), Big(1))
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assert.deepStrictEqual(coshBig(Big(1)), Big('1.5430806348152437785'))
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assert.deepStrictEqual(coshBig(Big(2)), Big('3.7621956910836314596'))
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assert.deepStrictEqual(coshBig(Big(3)), Big('10.067661995777765842'))
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assert.deepStrictEqual(coshBig(bigmath.pi).toString(), '11.591953275521520628')
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assert.deepStrictEqual(coshBig(arg9).toString(), 'Infinity')
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assert.deepStrictEqual(coshBig(arg10).toString(), 'Infinity')
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// Ensure args were not changed
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assert.deepStrictEqual(arg1, Big(-3))
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assert.deepStrictEqual(arg9.toString(), 'Infinity')
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assert.deepStrictEqual(arg10.toString(), '-Infinity')
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})
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it('should return the cosh of a complex number', function () {
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approxDeepEqual(cosh(complex('1')), complex(1.5430806348152, 0))
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approxDeepEqual(cosh(complex('i')), complex(0.54030230586814, 0))
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approxDeepEqual(cosh(complex('2 + i')), complex(2.0327230070197, 3.0518977991518))
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})
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it('should throw an error on an angle', function () {
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assert.throws(() => cosh(unit('90deg')), TypeError)
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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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const cosh123 = [1.5430806348152, 3.7621956910836, 10.067661995778]
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it('should not operate on an array', function () {
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assert.throws(() => cosh([1, 2, 3]), TypeError)
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approxDeepEqual(math.map([1, 2, 3], cosh), cosh123)
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})
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it('should not operate on a matrix', function () {
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assert.throws(() => cosh(matrix([1, 2, 3])), TypeError)
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approxDeepEqual(math.map(matrix([1, 2, 3]), cosh), 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() }, /TypeError: Too few arguments/)
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assert.throws(function () { cosh(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should LaTeX cosh', function () {
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const expression = math.parse('cosh(1)')
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assert.strictEqual(expression.toTex(), '\\cosh\\left(1\\right)')
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})
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})
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