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33 lines
1.5 KiB
JavaScript
33 lines
1.5 KiB
JavaScript
var assert = require('assert'),
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error = require('../../../lib/error/index'),
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math = require('../../../index'),
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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.equal(composition(5,3), 6);
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assert.equal(composition(1,1), 1);
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assert.equal(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.equal(composition(math.bignumber(7), math.bignumber(5)), math.bignumber(15));
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assert.equal(composition(math.bignumber(70), math.bignumber(3)), math.bignumber(2346));
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assert.equal(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);
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assert.throws(function() {composition(3, 5)}, TypeError);
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assert.throws(function() {composition(math.bignumber(3), math.bignumber(5))}, TypeError);
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assert.throws(function() {composition(math.bignumber(3.5), math.bignumber(-3))}, TypeError);
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assert.throws(function() {composition(math.bignumber(3.5), 1/3)}, TypeError);
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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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