1 files changed, 40 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/bouncetrackingprotection/test/browser/file_web_worker.js b/toolkit/components/antitracking/bouncetrackingprotection/test/browser/file_web_worker.js
new file mode 100644
index 0000000000..78fdf2a149
--- /dev/null
+++ b/toolkit/components/antitracking/bouncetrackingprotection/test/browser/file_web_worker.js
@@ -0,0 +1,40 @@
+// A web worker which can set indexedDB.
+
+function setIndexedDB() {
+  return new Promise((resolve, reject) => {
+    let request = self.indexedDB.open("bounce", 1);
+    request.onsuccess = () => {
+      console.info("Opened indexedDB");
+      resolve();
+    };
+    request.onerror = event => {
+      console.error("Error opening indexedDB", event);
+      reject();
+    };
+    request.onupgradeneeded = event => {
+      console.info("Initializing indexedDB");
+      let db = event.target.result;
+      db.createObjectStore("bounce");
+    };
+  });
+}
+
+self.onmessage = function (event) {
+  console.info("Web worker received message", event.data);
+
+  if (event.data === "setIndexedDB") {
+    setIndexedDB().then(() => {
+      self.postMessage("indexedDBSet");
+    });
+  } else if (event.data === "setIndexedDBNested") {
+    console.info("set state nested");
+    // Rather than setting indexedDB in this worker spawn a nested worker to set
+    // indexedDB.
+    let nestedWorker = new Worker("file_web_worker.js");
+    nestedWorker.postMessage("setIndexedDB");
+    nestedWorker.onmessage = () => {
+      console.info("IndexedDB set in nested worker");
+      self.postMessage("indexedDBSet");
+    };
+  }
+};