// See tests at https://github.com/mathiasbynens/String.prototype.at

'use strict';

module.exports = function (t, a) {
	a(t.length, 1, "Length");

	a.h1("BMP");
	a(t.call('abc\uD834\uDF06def', -Infinity), '', "-Infinity");
	a(t.call('abc\uD834\uDF06def', -1), '', "-1");
	a(t.call('abc\uD834\uDF06def', -0), 'a', "-0");
	a(t.call('abc\uD834\uDF06def', +0), 'a', "+0");
	a(t.call('abc\uD834\uDF06def', 1), 'b', "1");
	a(t.call('abc\uD834\uDF06def', 3), '\uD834\uDF06', "3");
	a(t.call('abc\uD834\uDF06def', 4), '\uDF06', "4");
	a(t.call('abc\uD834\uDF06def', 5), 'd', "5");
	a(t.call('abc\uD834\uDF06def', 42), '', "42");
	a(t.call('abc\uD834\uDF06def', +Infinity), '', "+Infinity");
	a(t.call('abc\uD834\uDF06def', null), 'a', "null");
	a(t.call('abc\uD834\uDF06def', undefined), 'a', "undefined");
	a(t.call('abc\uD834\uDF06def'), 'a', "No argument");
	a(t.call('abc\uD834\uDF06def', false), 'a', "false");
	a(t.call('abc\uD834\uDF06def', NaN), 'a', "NaN");
	a(t.call('abc\uD834\uDF06def', ''), 'a', "Empty string");
	a(t.call('abc\uD834\uDF06def', '_'), 'a', "_");
	a(t.call('abc\uD834\uDF06def', '1'), 'b', "'1'");
	a(t.call('abc\uD834\uDF06def', []), 'a', "[]");
	a(t.call('abc\uD834\uDF06def', {}), 'a', "{}");
	a(t.call('abc\uD834\uDF06def', -0.9), 'a', "-0.9");
	a(t.call('abc\uD834\uDF06def', 1.9), 'b', "1.9");
	a(t.call('abc\uD834\uDF06def', 7.9), 'f', "7.9");
	a(t.call('abc\uD834\uDF06def', Math.pow(2, 32)), '', "Big number");

	a.h1("Astral symbol");
	a(t.call('\uD834\uDF06def', -Infinity), '', "-Infinity");
	a(t.call('\uD834\uDF06def', -1), '', "-1");
	a(t.call('\uD834\uDF06def', -0), '\uD834\uDF06', "-0");
	a(t.call('\uD834\uDF06def', +0), '\uD834\uDF06', "+0");
	a(t.call('\uD834\uDF06def', 1), '\uDF06', "1");
	a(t.call('\uD834\uDF06def', 2), 'd', "2");
	a(t.call('\uD834\uDF06def', 3), 'e', "3");
	a(t.call('\uD834\uDF06def', 4), 'f', "4");
	a(t.call('\uD834\uDF06def', 42), '', "42");
	a(t.call('\uD834\uDF06def', +Infinity), '', "+Infinity");
	a(t.call('\uD834\uDF06def', null), '\uD834\uDF06', "null");
	a(t.call('\uD834\uDF06def', undefined), '\uD834\uDF06', "undefined");
	a(t.call('\uD834\uDF06def'), '\uD834\uDF06', "No arguments");
	a(t.call('\uD834\uDF06def', false), '\uD834\uDF06', "false");
	a(t.call('\uD834\uDF06def', NaN), '\uD834\uDF06', "NaN");
	a(t.call('\uD834\uDF06def', ''), '\uD834\uDF06', "Empty string");
	a(t.call('\uD834\uDF06def', '_'), '\uD834\uDF06', "_");
	a(t.call('\uD834\uDF06def', '1'), '\uDF06', "'1'");

	a.h1("Lone high surrogates");
	a(t.call('\uD834abc', -Infinity), '', "-Infinity");
	a(t.call('\uD834abc', -1), '',  "-1");
	a(t.call('\uD834abc', -0), '\uD834', "-0");
	a(t.call('\uD834abc', +0), '\uD834', "+0");
	a(t.call('\uD834abc', 1), 'a', "1");
	a(t.call('\uD834abc', 42), '', "42");
	a(t.call('\uD834abc', +Infinity), '', "Infinity");
	a(t.call('\uD834abc', null), '\uD834', "null");
	a(t.call('\uD834abc', undefined), '\uD834', "undefined");
	a(t.call('\uD834abc'), '\uD834', "No arguments");
	a(t.call('\uD834abc', false), '\uD834', "false");
	a(t.call('\uD834abc', NaN), '\uD834', "NaN");
	a(t.call('\uD834abc', ''), '\uD834', "Empty string");
	a(t.call('\uD834abc', '_'), '\uD834', "_");
	a(t.call('\uD834abc', '1'), 'a', "'a'");

	a.h1("Lone low surrogates");
	a(t.call('\uDF06abc', -Infinity), '', "-Infinity");
	a(t.call('\uDF06abc', -1), '', "-1");
	a(t.call('\uDF06abc', -0), '\uDF06', "-0");
	a(t.call('\uDF06abc', +0), '\uDF06', "+0");
	a(t.call('\uDF06abc', 1), 'a', "1");
	a(t.call('\uDF06abc', 42), '', "42");
	a(t.call('\uDF06abc', +Infinity), '', "+Infinity");
	a(t.call('\uDF06abc', null), '\uDF06', "null");
	a(t.call('\uDF06abc', undefined), '\uDF06', "undefined");
	a(t.call('\uDF06abc'), '\uDF06', "No arguments");
	a(t.call('\uDF06abc', false), '\uDF06', "false");
	a(t.call('\uDF06abc', NaN), '\uDF06', "NaN");
	a(t.call('\uDF06abc', ''), '\uDF06', "Empty string");
	a(t.call('\uDF06abc', '_'), '\uDF06', "_");
	a(t.call('\uDF06abc', '1'), 'a', "'1'");

	a.h1("Context");
	a.throws(function () { t.call(undefined); }, TypeError, "Undefined");
	a.throws(function () { t.call(undefined, 4); }, TypeError,
		"Undefined + argument");
	a.throws(function () { t.call(null); }, TypeError, "Null");
	a.throws(function () { t.call(null, 4); }, TypeError, "Null + argument");
	a(t.call(42, 0), '4', "Number #1");
	a(t.call(42, 1), '2', "Number #2");
	a(t.call({ toString: function () { return 'abc'; } }, 2), 'c', "Object");
};