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37 lines
1.8 KiB
JavaScript
37 lines
1.8 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/bundleAny'
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const stirlingS2 = math.stirlingS2
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describe('stirlingS2', function () {
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it('should calculate the number of ways to partition a set of n objects into k non-empty subsets', function () {
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assert.strictEqual(stirlingS2(5, 3), 25)
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assert.strictEqual(stirlingS2(0, 0), 1)
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assert.strictEqual(stirlingS2(8, 7), 28)
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})
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it('should calculate the stirlingS2 of n items taken k at a time with BigNumbers', function () {
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assert.deepStrictEqual(stirlingS2(math.bignumber(7), math.bignumber(5)), math.bignumber(140))
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assert.deepStrictEqual(stirlingS2(math.bignumber(8), math.bignumber(6)), math.bignumber(266))
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})
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it('should not work with non-integer and negative input', function () {
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assert.throws(function () { stirlingS2(0.5, 3) }, /Non-negative integer value expected/)
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assert.throws(function () { stirlingS2(-2, 3) }, /Non-negative integer value expected/)
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assert.throws(function () { stirlingS2(3, 5) }, /k must be less than or equal to n in function stirlingS2/)
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assert.throws(function () { stirlingS2(math.bignumber(3), math.bignumber(5)) }, /k must be less than or equal to n in function stirlingS2/)
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assert.throws(function () { stirlingS2(math.bignumber(3.5), math.bignumber(-3)) }, /Non-negative integer value expected/)
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assert.throws(function () { stirlingS2(math.bignumber(3.5), 1 / 3) }, /Non-negative integer value expected/)
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})
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it('should not work with the wrong number or type of arguments', function () {
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assert.throws(function () { stirlingS2(5, 3, 2) })
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assert.throws(function () { stirlingS2(true, 'hello world') })
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})
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it('should LaTeX stirlingS2', function () {
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const expression = math.parse('stirlingS2(3,2)')
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assert.strictEqual(expression.toTex(), '\\mathrm{S}\\left(3,2\\right)')
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})
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})
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