Tests: Add some more IndexedDB tests from WPT

Author: https://github.com/Zaggy1024
Commit: https://github.com/LadybirdBrowser/ladybird/commit/6a9ee92ec12
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8264

Tests/LibWeb/Text/input/wpt-import/IndexedDB/idb-explicit-commit-throw.any.js

@@ -0,0 +1,38 @@
+// META: script=resources/support-promises.js
+'use strict';
+
+setup({allow_uncaught_exception:true});
+
+promise_test(async testCase => {
+  // Register an event listener that will prevent the intentionally thrown
+  // error from bubbling up to the window and failing the testharness. This
+  // is necessary because currently allow_uncaught_exception does not behave
+  // as expected for promise_test.
+  //
+  // Git issue: https://github.com/web-platform-tests/wpt/issues/14041
+  self.addEventListener('error', (event) => { event.preventDefault(); });
+
+  const db = await createDatabase(testCase, async db => {
+    await createBooksStore(testCase, db);
+  });
+
+  const txn = db.transaction(['books'], 'readwrite');
+  const objectStore = txn.objectStore('books');
+  const putRequest = objectStore.put({isbn:'one', title:'title'});
+  txn.commit();
+  putRequest.onsuccess = () => {
+    throw new Error('This error thrown after an explicit commit should not ' +
+        'prevent the transaction from committing.');
+  }
+  await promiseForTransaction(testCase, txn);
+
+  // Ensure that despite the uncaught error after the put request, the explicit
+  // commit still causes the request to be committed.
+  const txn2 = db.transaction(['books'], 'readwrite');
+  const objectStore2 = txn2.objectStore('books');
+  const getRequest = objectStore2.get('one');
+  await promiseForTransaction(testCase, txn2);
+
+  assert_equals(getRequest.result.title, 'title');
+}, 'Any errors in callbacks that run after an explicit commit will not stop '
+   + 'the commit from being processed.');