1 files changed, 78 insertions, 0 deletions
diff --git a/dom/localstorage/test/helpers.js b/dom/localstorage/test/helpers.js
new file mode 100644
index 0000000000..f9dbdd21dc
--- /dev/null
+++ b/dom/localstorage/test/helpers.js
@@ -0,0 +1,78 @@
+/**
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// testSteps is expected to be defined by the test using this file.
+/* global testSteps:false */
+
+function executeSoon(aFun) {
+  SpecialPowers.Services.tm.dispatchToMainThread({
+    run() {
+      aFun();
+    },
+  });
+}
+
+function clearAllDatabases() {
+  let qms = SpecialPowers.Services.qms;
+  let principal = SpecialPowers.wrap(document).nodePrincipal;
+  let request = qms.clearStoragesForPrincipal(principal);
+  return request;
+}
+
+if (!window.runTest) {
+  window.runTest = async function () {
+    SimpleTest.waitForExplicitFinish();
+
+    info("Pushing preferences");
+
+    await SpecialPowers.pushPrefEnv({
+      set: [
+        ["dom.storage.testing", true],
+        ["dom.quotaManager.testing", true],
+      ],
+    });
+
+    info("Clearing old databases");
+
+    await requestFinished(clearAllDatabases());
+
+    SimpleTest.registerCleanupFunction(async function () {
+      await requestFinished(clearAllDatabases());
+    });
+  };
+}
+
+function returnToEventLoop() {
+  return new Promise(function (resolve) {
+    executeSoon(resolve);
+  });
+}
+
+function getLocalStorage() {
+  return localStorage;
+}
+
+class RequestError extends Error {
+  constructor(resultCode, resultName) {
+    super(`Request failed (code: ${resultCode}, name: ${resultName})`);
+    this.name = "RequestError";
+    this.resultCode = resultCode;
+    this.resultName = resultName;
+  }
+}
+
+async function requestFinished(request) {
+  await new Promise(function (resolve) {
+    request.callback = SpecialPowers.wrapCallback(function () {
+      resolve();
+    });
+  });
+
+  if (request.resultCode !== SpecialPowers.Cr.NS_OK) {
+    throw new RequestError(request.resultCode, request.resultName);
+  }
+
+  return request.result;
+}