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33 lines
1.4 KiB
JavaScript
33 lines
1.4 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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multinomial = math.multinomial,
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_ = require('underscore');
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describe('multinomial', function() {
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it('should calculate the multinomial of an array of numbers', function() {
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assert.equal(multinomial([1,2,1]), 12);
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assert.equal(multinomial([4,2,1]), 105);
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assert.equal(multinomial([4,4]), 70);
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});
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it('should calculate the multinomial of n items taken k at a time with BigNumbers', function() {
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assert.equal(_.isEqual(multinomial([math.bignumber(3), math.bignumber(4), math.bignumber(5)]), math.bignumber(27720)),true);
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assert.deepEqual(multinomial([math.bignumber(10), math.bignumber(1), math.bignumber(2)]), math.bignumber(858));
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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() {multinomial([0.5,3])}, TypeError);
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assert.throws(function() {multinomial([math.bignumber(3), math.bignumber(0.5)])}, TypeError);
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assert.throws(function() {multinomial([math.bignumber(3.5), math.bignumber(-3)])}, TypeError);
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assert.throws(function() {multinomial([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() {multinomial(5, 3, 2)});
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assert.throws(function() {multinomial(true, "hello world")});
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});
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});
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