mirror of
https://github.com/josdejong/mathjs.git
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98 lines
3.5 KiB
JavaScript
98 lines
3.5 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/defaultInstance.js'
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const isZero = math.isZero
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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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const unit = math.unit
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describe('isZero', function () {
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it('should test whether a number is zero', function () {
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assert.strictEqual(isZero(0), true)
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assert.strictEqual(isZero(-0), true)
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assert.strictEqual(isZero(2), false)
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assert.strictEqual(isZero(-3), false)
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assert.strictEqual(isZero(-0.5), false)
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assert.strictEqual(isZero(Infinity), false)
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assert.strictEqual(isZero(-Infinity), false)
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assert.strictEqual(isZero(NaN), false)
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})
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it('should test whether a bigint is zero', function () {
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assert.strictEqual(isZero(0n), true)
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assert.strictEqual(isZero(-0n), true)
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assert.strictEqual(isZero(2n), false)
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assert.strictEqual(isZero(-3n), false)
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})
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it('should test whether a number is near zero', function () {
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assert.strictEqual(isZero(1e-17), true)
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assert.strictEqual(isZero(1e-16), true)
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assert.strictEqual(isZero(1e-15), true)
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assert.strictEqual(isZero(1e-14), false)
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assert.strictEqual(isZero(1e-13), false)
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})
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it('should test whether a boolean is zero', function () {
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assert.strictEqual(isZero(true), false)
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assert.strictEqual(isZero(false), true)
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})
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it('should test whether a BigNumber is zero', function () {
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assert.strictEqual(isZero(bignumber(0)), true)
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assert.strictEqual(isZero(bignumber(-0)), true)
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assert.strictEqual(isZero(bignumber(2)), false)
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assert.strictEqual(isZero(bignumber(-3)), false)
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assert.strictEqual(isZero(bignumber(-0.5)), false)
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assert.strictEqual(isZero(bignumber(Infinity)), false)
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assert.strictEqual(isZero(bignumber(-Infinity)), false)
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assert.strictEqual(isZero(bignumber(NaN)), false)
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})
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it('should test whether a Fraction is zero', function () {
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assert.strictEqual(isZero(fraction(0)), true)
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assert.strictEqual(isZero(fraction(-0)), true)
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assert.strictEqual(isZero(fraction(2)), false)
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assert.strictEqual(isZero(fraction(-3)), false)
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})
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it('should test whether a string contains a zero value', function () {
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assert.strictEqual(isZero('0'), true)
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assert.strictEqual(isZero('-0'), true)
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assert.strictEqual(isZero('2'), false)
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assert.strictEqual(isZero('-3'), false)
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})
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it('should test whether a complex number is zero', function () {
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assert.strictEqual(isZero(complex(0, 0)), true)
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assert.strictEqual(isZero(complex(0, 1)), false)
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assert.strictEqual(isZero(complex(2, 0)), false)
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assert.strictEqual(isZero(complex(2, 4)), false)
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})
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it('should test whether a unit is zero', function () {
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assert.strictEqual(isZero(unit('0 m')), true)
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assert.strictEqual(isZero(unit('0 kB')), true)
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assert.strictEqual(isZero(unit('5 cm')), false)
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assert.strictEqual(isZero(unit('-3 inch')), false)
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})
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it('should test isZero element wise on an Array', function () {
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assert.deepStrictEqual(isZero([0, 5, 0, -3]), [true, false, true, false])
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})
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it('should test isZero element wise on a Matrix', function () {
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assert.deepStrictEqual(isZero(math.matrix([0, 5, 0, -3])), math.matrix([true, false, true, false]))
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})
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it('should throw an error in case of unsupported data types', function () {
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assert.throws(function () { isZero(new Date()) }, /TypeError: Unexpected type of argument/)
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assert.throws(function () { isZero({}) }, /TypeError: Unexpected type of argument/)
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})
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})
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