just/test/array-stdev/index.js at tape5 · hmmhmmhm/just

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var test = require('../util/test')(__filename);

var stdev = require('../../packages/array-stdev');

test('array of numbers returns standard deviation', function(t) {

t.plan(4);

t.equal(stdev([1, 2, 3]), 1);

t.equal(stdev([1, 2, 3, 2, 4, 1]).toFixed(4), '1.1690');

t.equal(stdev([3, 2.5, 1]).toFixed(4), '1.0408');

t.equal(stdev([1, 2, 3, 4, 5, 6]).toFixed(4), '1.8708');

t.end();

});

test('list of numeric arguments returns standard deviation', function(t) {

t.plan(4);

t.equal(stdev(2, 6, 4), 2);

t.equal(stdev(10, 10, 10, 10), 0);

t.equal(stdev(-1, -2, -3), 1);

t.equal(stdev(0.1, 0.2, 0.3).toFixed(2), '0.10');

t.end();

});

test('one or fewer values throw', function(t) {

t.plan(4);

t.throws(function() {

stdev([1]);

});

t.throws(function() {

stdev(17.1);

});

t.throws(function() {

stdev();

});

t.throws(function() {

stdev([]);

});

t.end();

});

test('non-numeric values throw', function(t) {

t.plan(4);

t.throws(function() {

stdev(['1', '2', '3']);

});

t.throws(function() {

stdev(['a', 'b', 'c']);

});

t.throws(function() {

stdev(undefined);

});

t.throws(function() {

stdev([NaN, NaN]);

});

t.end();

});

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