Tests.

test.js

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+'use strict';
+
+var test = require('tape');
+var isNumber = require('./');
+var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
+
+test('not Numbers', function (t) {
+	t.notOk(isNumber(), 'undefined is not Number');
+	t.notOk(isNumber(null), 'null is not Number');
+	t.notOk(isNumber(false), 'false is not Number');
+	t.notOk(isNumber(true), 'true is not Number');
+	t.notOk(isNumber('foo'), 'string is not Number');
+	t.notOk(isNumber([]), 'array is not Number');
+	t.notOk(isNumber({}), 'object is not Number');
+	t.notOk(isNumber(function () {}), 'function is not Number');
+	t.notOk(isNumber(/a/g), 'regex literal is not Number');
+	t.notOk(isNumber(new RegExp('a', 'g')), 'regex object is not Number');
+	t.notOk(isNumber(new Date()), 'new Date() is not Number');
+	t.end();
+});
+
+test('@@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, function (t) {
+	var fakeNumber = { valueOf: function () { return 42; }, toString: function () { return '7'; } };
+	fakeNumber[Symbol.toStringTag] = function () { return 'Number'; };
+	t.notOk(isNumber(fakeNumber), 'fake Number with @@toStringTag "Number" is not Number');
+	t.end();
+});
+
+test('Numbers', function (t) {
+	t.ok(isNumber(42), 'number is Number');
+	t.ok(isNumber(new Number(42)), 'number object is Number');
+	t.ok(isNumber(NaN), 'NaN is Number');
+	t.ok(isNumber(Infinity), 'Infinity is Number');
+	t.end();
+});