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54 lines
1.9 KiB
JavaScript
54 lines
1.9 KiB
JavaScript
var assert = require('assert'),
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math = require('../../../index')(),
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factorial = math.factorial;
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describe('factorial', function() {
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it('should calculate the factorial of a number', function() {
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assert.equal(factorial(0), 1);
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assert.equal(factorial(1), 1);
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assert.equal(factorial(2), 2);
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assert.equal(factorial(3), 6);
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assert.equal(factorial(4), 24);
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assert.equal(factorial(5), 120);
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});
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it('should calculate the factorial of a bignumber', function() {
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assert.deepEqual(factorial(math.bignumber(0)), math.bignumber(1));
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assert.deepEqual(factorial(math.bignumber(1)), math.bignumber(1));
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assert.deepEqual(factorial(math.bignumber(2)), math.bignumber(2));
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assert.deepEqual(factorial(math.bignumber(3)), math.bignumber(6));
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assert.deepEqual(factorial(math.bignumber(4)), math.bignumber(24));
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assert.deepEqual(factorial(math.bignumber(5)), math.bignumber(120));
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assert.deepEqual(factorial(math.bignumber(20)), math.bignumber('2432902008176640000'));
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});
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it('should calculate the factorial of a boolean', function() {
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assert.equal(factorial(true), 1);
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assert.equal(factorial(false), 1);
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});
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it('should calculate the factorial of each element in a matrix', function() {
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assert.deepEqual(factorial(math.matrix([0,1,2,3,4,5])), math.matrix([1,1,2,6,24,120]));
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});
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it('should calculate the factorial of each element in an array', function() {
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assert.deepEqual(factorial([0,1,2,3,4,5]), [1,1,2,6,24,120]);
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});
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it('should throw an error if called with negative number', function() {
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assert.throws(function() { factorial(-1); });
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});
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it('should throw an error if called with non-integer number', function() {
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assert.throws(function() { factorial(1.5); });
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});
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it('should throw en error if called with invalid number of arguments', function() {
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assert.throws(function() { factorial(); });
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assert.throws(function() { factorial(1,3); });
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});
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});
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