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33 lines
2.0 KiB
JavaScript
33 lines
2.0 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/bundleAny'
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const composition = math.composition
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describe('composition', function () {
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it('should calculate the number of ways to compose a set of n objects into k non-empty subsets', function () {
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assert.strictEqual(composition(5, 3), 6)
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assert.strictEqual(composition(1, 1), 1)
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assert.strictEqual(composition(8, 3), 21)
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})
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it('should calculate the composition of n items taken k at a time with BigNumbers', function () {
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assert.deepStrictEqual(composition(math.bignumber(7), math.bignumber(5)), math.bignumber(15))
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assert.deepStrictEqual(composition(math.bignumber(70), math.bignumber(3)), math.bignumber(2346))
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assert.deepStrictEqual(composition(math.bignumber(56), math.bignumber(11)), math.bignumber(29248649430))
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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 () { composition(0.5, 3) }, /TypeError: Positive integer value expected in function composition/)
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assert.throws(function () { composition(-2, 3) }, /TypeError: Positive integer value expected in function composition/)
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assert.throws(function () { composition(6, -2) }, /TypeError: Positive integer value expected in function composition/)
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assert.throws(function () { composition(3, 5) }, /TypeError: k must be less than or equal to n in function composition/)
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assert.throws(function () { composition(math.bignumber(3), math.bignumber(5)) }, /TypeError: k must be less than or equal to n in function composition/)
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assert.throws(function () { composition(math.bignumber(3.5), math.bignumber(-3)) }, /TypeError: Positive integer value expected in function composition/)
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assert.throws(function () { composition(math.bignumber(3.5), 0.25) }, /TypeError: Positive integer value expected in function composition/)
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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 () { composition(5, 3, 2) })
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assert.throws(function () { composition(true, 'hello world') })
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})
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})
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