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40 lines
1.8 KiB
JavaScript
40 lines
1.8 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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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.equal(stirlingS2(5,3), 25);
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assert.equal(stirlingS2(0,0), 1);
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assert.equal(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.deepEqual(stirlingS2(math.bignumber(7), math.bignumber(5)),math.bignumber(140));
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assert.deepEqual(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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var expression = math.parse('stirlingS2(3,2)');
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assert.equal(expression.toTex(), '\\mathrm{S}\\left(3,2\\right)');
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});
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});
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