28 lines
737 B
JavaScript
28 lines
737 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('harmonic_mean', function(t) {
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// From http://en.wikipedia.org/wiki/Harmonic_mean
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test('can get the mean of two or more numbers', function(t) {
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t.equal(ss.harmonic_mean([1, 1]), 1);
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t.equal(rnd(ss.harmonic_mean([2, 3])), 2.4);
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t.equal(ss.harmonic_mean([1, 2, 4]), 12 / 7);
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t.end();
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});
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test('returns null for empty lists', function(t) {
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t.equal(ss.harmonic_mean([]), null);
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t.end();
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});
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test('returns null for lists with negative numbers', function(t) {
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t.equal(ss.harmonic_mean([-1]), 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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