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<!DOCTYPE html>
<title>Custom Elements: CustomElementRegistry.getName function</title>
<meta name="author" title="Keith Cirkel" href="mailto:keithamus@github.com">
<meta name="assert" content="CustomElementRegistry.getName function exists">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(function () {
assert_equals(customElements.getName(class extends HTMLElement {}), null);
}, 'customElements.getName must return null when the registry does not contain an entry with the given constructor');
test(function () {
assert_throws_js(TypeError, function () { customElements.getName(undefined); },
'customElements.getName must throw a TypeError when the element interface is undefined');
assert_throws_js(TypeError, function () { customElements.getName(null); },
'customElements.getName must throw a TypeError when the element interface is null');
assert_throws_js(TypeError, function () { customElements.getName('foo-bar'); },
'customElements.getName must throw a TypeError when the element interface is a string');
assert_throws_js(TypeError, function () { customElements.getName(1); },
'customElements.getName must throw a TypeError when the element interface is a number');
assert_throws_js(TypeError, function () { customElements.getName({}); },
'customElements.getName must throw a TypeError when the element interface is an object');
assert_throws_js(TypeError, function () { customElements.getName([]) },
'customElements.getName must throw a TypeError when the element interface is an array');
}, 'customElements.getName must throw when the element interface is not a constructor');
test(function () {
class OtherExistingCustomElement extends HTMLElement {};
class SecondExistingCustomElement extends HTMLElement {};
assert_throws_js(TypeError, function () { customElements.getName(customElements.getName(OtherExistingCustomElement)); },
'customElements.getName must throw a TypeError when the element interface is undefined');
customElements.define('other-existing-custom-element', OtherExistingCustomElement);
customElements.define('second-existing-custom-element', SecondExistingCustomElement);
assert_equals(customElements.getName(OtherExistingCustomElement), 'other-existing-custom-element');
assert_equals(customElements.getName(SecondExistingCustomElement), 'second-existing-custom-element');
}, 'customElements.getName returns the name of the entry with the given constructor when there is a matching entry.');
test(function () {
class ButtonCustomBuiltInElement extends HTMLButtonElement {};
class InputCustomBuiltInElement extends HTMLInputElement {};
customElements.define('button-custom-built-in-element', ButtonCustomBuiltInElement, { extends: 'button' });
customElements.define('input-custom-built-in-element', InputCustomBuiltInElement, { extends: 'input' });
assert_equals(customElements.getName(ButtonCustomBuiltInElement), 'button-custom-built-in-element');
assert_equals(customElements.getName(InputCustomBuiltInElement), 'input-custom-built-in-element');
}, 'customElements.getName returns the name of the entry with the given customized built in constructor when there is a matching entry.');
</script>
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