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79 lines
3.2 KiB
JavaScript
79 lines
3.2 KiB
JavaScript
// test unary minus
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const assert = require('assert')
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const math = require('../../../src/main')
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const bignumber = math.bignumber
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const fraction = math.fraction
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const complex = math.complex
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describe('unaryMinus', function () {
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it('should return unary minus of a boolean', function () {
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assert.equal(math.unaryMinus(true), -1)
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assert.equal(math.unaryMinus(false), 0)
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})
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// TODO: unary minus should return bignumber on boolean input when configured for bignumber
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it.skip('should return bignumber unary minus of a boolean', function () {
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const bigmath = math.create({number: 'BigNumber'})
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assert.deepEqual(bigmath.unaryMinus(true), bigmath.bignumber(-1))
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assert.deepEqual(bigmath.unaryMinus(false), bigmath.bignumber(0))
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})
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it('should perform unary minus of a number', function () {
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assert.deepEqual(math.unaryMinus(2), -2)
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assert.deepEqual(math.unaryMinus(-2), 2)
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assert.deepEqual(math.unaryMinus(0), 0)
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})
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it('should perform unary minus of a big number', function () {
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assert.deepEqual(math.unaryMinus(bignumber(2)), bignumber(-2))
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assert.deepEqual(math.unaryMinus(bignumber(-2)), bignumber(2))
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assert.deepEqual(math.unaryMinus(bignumber(0)).toString(), '0')
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})
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it('should perform unary minus of a fraction', function () {
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const a = fraction(0.5)
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assert(math.unaryMinus(a) instanceof math.type.Fraction)
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assert.equal(a.toString(), '0.5')
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assert.equal(math.unaryMinus(fraction(0.5)).toString(), '-0.5')
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assert.equal(math.unaryMinus(fraction(-0.5)).toString(), '0.5')
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})
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it('should perform unary minus of a complex number', function () {
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assert.equal(math.unaryMinus(math.complex(3, 2)), '-3 - 2i')
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assert.equal(math.unaryMinus(math.complex(3, -2)), '-3 + 2i')
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assert.equal(math.unaryMinus(math.complex(-3, 2)), '3 - 2i')
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assert.equal(math.unaryMinus(math.complex(-3, -2)), '3 + 2i')
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})
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it('should perform unary minus of a unit', function () {
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assert.equal(math.unaryMinus(math.unit(5, 'km')).toString(), '-5 km')
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assert.equal(math.unaryMinus(math.unit(fraction(2 / 3), 'km')).toString(), '-2/3 km')
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assert.equal(math.unaryMinus(math.unit(complex(2, -4), 'gal')).toString(), '(-2 + 4i) gal')
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})
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it('should perform element-wise unary minus on a matrix', function () {
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const a2 = math.matrix([[1, 2], [3, 4]])
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const a7 = math.unaryMinus(a2)
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assert.ok(a7 instanceof math.type.Matrix)
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assert.deepEqual(a7.size(), [2, 2])
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assert.deepEqual(a7.valueOf(), [[-1, -2], [-3, -4]])
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assert.deepEqual(math.unaryMinus([[1, 2], [3, 4]]), [[-1, -2], [-3, -4]])
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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 () { math.unaryMinus() }, /TypeError: Too few arguments/)
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assert.throws(function () { math.unaryMinus(1, 2) }, /TypeError: Too many arguments/)
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})
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it('should throw an error in case of invalid type of argument', function () {
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assert.throws(function () { math.unaryMinus(new Date()) }, /TypeError: Unexpected type of argument/)
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assert.throws(function () { math.unaryMinus(null) }, /TypeError: Unexpected type of argument/)
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})
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it('should LaTeX unaryMinus', function () {
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const expression = math.parse('unaryMinus(1)')
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assert.equal(expression.toTex(), '-\\left(1\\right)')
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})
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})
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