mann-whitney-utest/test/test.js

The Mann-Whitney U test is a nonparametric statistical test

// Mann-Whitney U test
// Luke Mitchell, April 2016
// https://github.com/lukem512/mann-whitney-utest

var mwu = require('../src/mann-whitney');

var tests = [
	{
		name: 'Simple U test #1',
		expected: [19.5, 44.5],
		rejected: false,
		samples: [
			[30, 14, 6, 11, 88, 1, 3, 7],
			[12, 15, 16, 42, 9, 9, 30, 28]
		]
	},

	{
		name: 'Simple U test #2',
		expected: [48.5, 23.5],
		rejected: false,
		samples: [
			[1, 4, 9, 6, 4, 3, 5, 6, 4],
			[1, 5, 3, 2, 5, 4, 1, 5]
		]
	},

	{
		name: 'Sample count > 2',
		rejected: true,
		samples: [
			[30, 14, 6, 11, 88, 1, 3, 7],
			[12, 15, 16, 42, 9, 9, 30, 28],
			[1, 2, 3, 4, 5, 6, 7, 8]
		]
	},

	{
		name: 'Empty sample array',
		rejected: true,
		samples: []
	},

	{
		name: 'Empty samples',
		rejected: true,
		samples: [[],[]]
	},

	{
		name: 'Non-array sample (string)',
		rejected: true,
		samples: 'hello'
	},

	{
		name: 'Non-array sample (numeric)',
		rejected: true,
		samples: 30
	},

	{
		name: 'Non-array sample (boolean)',
		rejected: true,
		samples: true
	},

	{
		name: 'Non-array sample (object)',
		rejected: true,
		samples: { some: 'json' }
	},

	{
		name: 'Non-array sample (function)',
		rejected: true,
		samples: function() { return []; }
	},

	{
		name: 'Non-array sample (null)',
		rejected: true,
		samples: null
	}
];

var returnCode = 0;

tests.forEach(function(t) {
	try {
		var u = mwu.test(t.samples);
		if (!mwu.check(u, t.samples)) throw Error('Check failed');
		if (!t.expected) throw Error('Unexpected results');

		u.forEach(function(o, index) {
			if (t.expected[index] !== o)
				throw Error('Returned results did not match expected results');
		})
	} catch (err) {
		if (!t.rejected) {
			console.error(t.name, err);
			passed = 1;
		}
	}
});

process.exit(returnCode);