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Test Info:

// META: title=IndexedDB
// META: global=window,worker
// META: script=resources/support.js
'use strict';
indexeddb_test(
function(t, db) {
db.createObjectStore('store');
},
function(t, db) {
let tx = db.transaction('store', 'readwrite', {durability: 'relaxed'});
let store = tx.objectStore('store');
let r1 = store.add('value', 'key');
r1.onerror = t.unreached_func('first add should succeed');
let r2 = store.add('value', 'key');
r2.onsuccess = t.unreached_func('second add should fail');
r2.onerror = t.step_func(function() {
assert_true(r2.error instanceof DOMException);
assert_equals(r2.error.name, 'ConstraintError');
});
tx.oncomplete = t.unreached_func('transaction should not complete');
tx.onabort = t.step_func(function() {
assert_true(tx.error instanceof DOMException);
assert_equals(tx.error.name, 'ConstraintError');
t.done();
});
},
'IDBRequest and IDBTransaction error properties should be DOMExceptions');