25 lines
573 B
JavaScript
25 lines
573 B
JavaScript
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var test = require('tape');
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var ss = require('../');
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function rnd(x) {
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return Math.round(x * 1000) / 1000;
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}
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test('variance', function(t) {
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test('can get the variance of a six-sided die', function(t) {
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t.equal(rnd(ss.variance([1, 2, 3, 4, 5, 6])), 2.917);
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t.end();
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});
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test('the variance of one number is zero', function(t) {
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t.equal(rnd(ss.variance([1])), 0);
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t.end();
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});
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test('the variance of no numbers is null', function(t) {
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t.equal(ss.variance([]), null);
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t.end();
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});
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t.end();
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});
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