--- /dev/null
+'use strict';
+
+var test = require('tape');
+var isNumber = require('../');
+var hasSymbols = require('has-symbols')();
+
+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 = {
+ toString: function () { return '7'; },
+ valueOf: function () { return 42; }
+ };
+ fakeNumber[Symbol.toStringTag] = '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(Object(42)), 'number object is Number');
+ t.ok(isNumber(NaN), 'NaN is Number');
+ t.ok(isNumber(Infinity), 'Infinity is Number');
+ t.end();
+});