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26 lines
831 B
JavaScript
26 lines
831 B
JavaScript
var assert = require('assert'),
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math = require('../../../index')(),
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combinations = math.combinations;
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describe('combinations', function() {
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it('should calculate the combinations of a number taking k at a time', function() {
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assert.equal(combinations(0, 0), 1);
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assert.equal(combinations(7, 5), 21);
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assert.equal(combinations(20, 15), 15504);
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assert.equal(combinations(63, 7), 553270671);
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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() {combinations(0.5, 3)});
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assert.throws(function() {combinations(3, 5)});
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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() {combinations(5, 3, 2)});
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assert.throws(function() {combinations(true, "hello world")});
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});
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});
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