function shouldBe(actual, expected) {
    if (actual !== expected)
        throw new Error('bad value: ' + actual);
}

function shouldThrow(func, expected) {
    var error = null;
    try {
        func();
    } catch (e) {
        error = e;
    }
    if (!error)
        throw new Error('not thrown');
    shouldBe(String(error), expected);
}

var errorKey = {
    toString() {
        throw new Error('out');
    }
};
var string = 'Cocoa, Cappuccino, Rize, Matcha, Kilimanjaro';

shouldThrow(function () {
    String.prototype.search.call(null, /Cocoa/);
}, "TypeError: String.prototype.search requires that |this| not be null or undefined");

shouldThrow(function () {
    String.prototype.search.call(undefined, /Cocoa/);
}, "TypeError: String.prototype.search requires that |this| not be null or undefined");

shouldThrow(function () {
    string.search(errorKey);
}, "Error: out");

shouldBe('Cocoa'.search(/Cocoa/), 0);

shouldBe(string.search(/Rize/), 19);
shouldBe(string.search('Rize'), 19);
shouldBe(string.search(/Matcha/), 25);
shouldBe(string.search('Matcha'), 25);

shouldBe('    undefined'.search(), 0);
shouldBe('    undefined'.search('undefined'), 4);

shouldBe((/Cocoa/)[Symbol.search]('Cocoa'), 0);

var primitives = [
    '',
    'string',
    null,
    undefined,
    42,
    Symbol('Cocoa'),
];

for (var primitive of primitives) {
    shouldThrow(function () {
        RegExp.prototype[Symbol.search].call(primitive)
    }, 'TypeError: RegExp.prototype.@@search requires that |this| be an Object');
}

shouldThrow(function () {
    /Cocoa/[Symbol.search](errorKey);
}, "Error: out");


function testRegExpSearch(regexp, string, result, lastIndex) {
    shouldBe(regexp[Symbol.search](string), result);
    shouldBe(regexp.lastIndex, lastIndex);
}

function testSearch(regexp, string, result, lastIndex) {
    shouldBe(string.search(regexp), result);
    shouldBe(regexp.lastIndex, lastIndex);
}

function testBoth(regexp, string, result, lastIndex) {
    testSearch(regexp, string, result, lastIndex);
    testRegExpSearch(regexp, string, result, lastIndex);
}

var cocoa = /Cocoa/;
cocoa.lastIndex = 20;
testBoth(cocoa, 'Cocoa', 0, 20);
testBoth(cocoa, '  Cocoa', 2, 20);
testBoth(cocoa, '  ', -1, 20);

var multibyte = /ココア/;
multibyte.lastIndex = 20;
testBoth(multibyte, 'ココア', 0, 20);
testBoth(multibyte, '  Cocoa', -1, 20);
testBoth(multibyte, 'カプチーノ', -1, 20);

function alwaysUnmatch(string) {
    return -1;
}

var regexp = new RegExp('ココア');
regexp[Symbol.search] = alwaysUnmatch;
shouldBe(regexp[Symbol.search], alwaysUnmatch);
testBoth(regexp, 'ココア', -1, 0);