diff -r 000000000000 -r 6474c204b198 toolkit/content/tests/browser/browser_input_file_tooltips.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/content/tests/browser/browser_input_file_tooltips.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+function test()
+{
+  let data = [
+    { value: "/tmp", result: "tmp" },
+    { title: "foo", result: "foo" },
+    { result: "No file selected." },
+    { multiple: true, result: "No files selected." },
+    { required: true, result: "Please select a file." }
+  ];
+
+  let doc = gBrowser.contentDocument;
+  let tooltip = document.getElementById("aHTMLTooltip");
+
+  for (let test of data) {
+    let input = doc.createElement('input');
+    doc.body.appendChild(input);
+    input.type = 'file';
+    if (test.title) {
+      input.setAttribute('title', test.title);
+    }
+    if (test.value) {
+      if (test.value == "/tmp" && navigator.platform.indexOf('Win') != -1) {
+        test.value = "C:\\Temp";
+        test.result = "Temp";
+      }
+      input.value = test.value;
+    }
+    if (test.multiple) {
+      input.multiple = true;
+    }
+    if (test.required) {
+      input.required = true;
+    }
+
+    ok(tooltip.fillInPageTooltip(input));
+    is(tooltip.getAttribute('label'), test.result);
+  }
+}