1 files changed, 55 insertions, 0 deletions
diff --git a/dom/file/tests/fileapi_chromeScript.js b/dom/file/tests/fileapi_chromeScript.js
new file mode 100644
index 0000000000..e93f17cd53
--- /dev/null
+++ b/dom/file/tests/fileapi_chromeScript.js
@@ -0,0 +1,55 @@
+/* eslint-env mozilla/chrome-script */
+
+// eslint-disable-next-line mozilla/reject-importGlobalProperties
+Cu.importGlobalProperties(["File"]);
+
+function createFileWithData(fileData) {
+  var willDelete = fileData === null;
+
+  var dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(
+    Ci.nsIProperties
+  );
+
+  var testFile = dirSvc.get("ProfD", Ci.nsIFile);
+  testFile.append("fileAPItestfile");
+  testFile.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0o600);
+
+  var outStream = Cc[
+    "@mozilla.org/network/file-output-stream;1"
+  ].createInstance(Ci.nsIFileOutputStream);
+  outStream.init(
+    testFile,
+    0x02 | 0x08 | 0x20, // write, create, truncate
+    0o666,
+    0
+  );
+  if (willDelete) {
+    fileData = "some irrelevant test data\n";
+  }
+  outStream.write(fileData, fileData.length);
+  outStream.close();
+  return File.createFromNsIFile(testFile).then(domFile => {
+    if (willDelete) {
+      testFile.remove(/* recursive: */ false);
+    }
+
+    return domFile;
+  });
+}
+
+addMessageListener("files.open", function (message) {
+  let promises = [];
+  let list = [];
+
+  for (let fileData of message) {
+    promises.push(
+      createFileWithData(fileData).then(domFile => {
+        list.push(domFile);
+      })
+    );
+  }
+
+  Promise.all(promises).then(() => {
+    sendAsyncMessage("files.opened", list);
+  });
+});