1 files changed, 99 insertions, 0 deletions
diff --git a/dom/ipc/tests/test_bug1086684.js b/dom/ipc/tests/test_bug1086684.js
new file mode 100644
index 0000000000..c5d4836d98
--- /dev/null
+++ b/dom/ipc/tests/test_bug1086684.js
@@ -0,0 +1,99 @@
+"use strict";
+/* eslint-env mozilla/frame-script */
+
+const { AddonTestUtils } = ChromeUtils.import(
+  "resource://testing-common/AddonTestUtils.jsm"
+);
+const { ExtensionTestUtils } = ChromeUtils.import(
+  "resource://testing-common/ExtensionXPCShellUtils.jsm"
+);
+
+AddonTestUtils.init(this);
+ExtensionTestUtils.init(this);
+
+const childFramePath = "/file_bug1086684.html";
+const childFrameURL = "http://example.com" + childFramePath;
+
+const childFrameContents = `<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="UTF-8">
+</head>
+<body>
+<div id="content">
+    <input type="file" id="f">
+</div>
+</body>
+</html>`;
+
+const server = AddonTestUtils.createHttpServer({ hosts: ["example.com"] });
+server.registerPathHandler(childFramePath, (request, response) => {
+  response.write(childFrameContents);
+});
+
+function childFrameScript() {
+  "use strict";
+
+  let { MockFilePicker } = ChromeUtils.import(
+    "resource://testing-common/MockFilePicker.jsm"
+  );
+
+  function parentReady(message) {
+    MockFilePicker.init(content);
+    MockFilePicker.setFiles([message.data.file]);
+    MockFilePicker.returnValue = MockFilePicker.returnOK;
+
+    let input = content.document.getElementById("f");
+    input.addEventListener("change", () => {
+      MockFilePicker.cleanup();
+      let value = input.value;
+      message.target.sendAsyncMessage("testBug1086684:childDone", { value });
+    });
+
+    input.focus();
+    input.click();
+  }
+
+  addMessageListener("testBug1086684:parentReady", function(message) {
+    parentReady(message);
+  });
+}
+
+add_task(async function() {
+  let page = await ExtensionTestUtils.loadContentPage(childFrameURL, {
+    remote: true,
+  });
+
+  page.loadFrameScript(childFrameScript);
+
+  await new Promise(resolve => {
+    let test;
+    function* testStructure(mm) {
+      let value;
+
+      function testDone(msg) {
+        test.next(msg.data.value);
+      }
+
+      mm.addMessageListener("testBug1086684:childDone", testDone);
+
+      let blob = new Blob([]);
+      let file = new File([blob], "helloworld.txt", { type: "text/plain" });
+
+      mm.sendAsyncMessage("testBug1086684:parentReady", { file });
+      value = yield;
+
+      // Note that the "helloworld.txt" passed in above doesn't affect the
+      // 'value' getter. Because we're mocking a file using a blob, we ask the
+      // blob for its path, which is the empty string.
+      equal(value, "", "got the right answer and didn't crash");
+
+      resolve();
+    }
+
+    test = testStructure(page.browser.messageManager);
+    test.next();
+  });
+
+  await page.close();
+});