1 files changed, 46 insertions, 0 deletions
diff --git a/testing/web-platform/tests/storage/helpers.js b/testing/web-platform/tests/storage/helpers.js
new file mode 100644
index 0000000000..b524c1b82c
--- /dev/null
+++ b/testing/web-platform/tests/storage/helpers.js
@@ -0,0 +1,46 @@
+/**
+ * @description - Function will create a database with the supplied name
+ *                and also create an object store with the specified name.
+ *                If a db with the name dbName exists, this will raze the
+ *                existing DB beforehand.
+ * @param {string} dbName
+ * @param {string} objectStoreName
+ * @param {testCase} t
+ * @returns {Promise} - A promise that resolves to an indexedDB open request
+ */
+function createDB(dbName, objectStoreName, t) {
+  return new Promise((resolve, reject) => {
+    const openRequest = indexedDB.open(dbName);
+    t.add_cleanup(() => {
+      indexedDB.deleteDatabase(dbName);
+    });
+    openRequest.onerror = () => {
+      reject(openRequest.error);
+    };
+    openRequest.onsuccess = () => {
+      resolve(openRequest.result);
+    };
+    openRequest.onupgradeneeded = (event) => {
+      openRequest.result.createObjectStore(objectStoreName);
+    };
+  });
+}
+
+/**
+ * @description - This function will wrap an IDBTransaction in a promise,
+ *                resolving in the oncomplete() method and rejecting with the
+ *                transaction error in the onabort() case.
+ * @param {IDBTransaction} transaction - The transaction to wrap in a promise.
+ * @returns {Promise} - A promise that resolves when the transaction is either
+ *                      aborted or completed.
+ */
+function transactionPromise(transaction) {
+  return new Promise((resolve, reject) => {
+    transaction.onabort = () => {
+      reject(transaction.error);
+    };
+    transaction.oncomplete = () => {
+      resolve();
+    };
+  });
+}