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diff --git a/dom/html/test/test_set_input_files.html b/dom/html/test/test_set_input_files.html
new file mode 100644
index 0000000000..3b7bf20909
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+++ b/dom/html/test/test_set_input_files.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1384030
+-->
+<head>
+  <title>Test for Setting &lt;input type=file&gt;.files </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1384030">Mozilla Bug 1384030</a>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Setting <input type=file>.files **/
+
+function runTest()
+{
+  const form = document.createElement("form");
+  const formInput = document.createElement("input");
+  formInput.type = "file";
+  formInput.name = "inputFile";
+  form.appendChild(formInput);
+
+  const input = document.createElement("input");
+  input.type = "file";
+  SpecialPowers.wrap(input).mozSetFileArray([
+    new File(["foo"], "foo"),
+    new File(["bar"], "bar")
+  ]);
+
+  formInput.files = input.files;
+
+  const inputFiles = (new FormData(form)).getAll("inputFile");
+  is(inputFiles.length, 2, "FormData should contain two input files");
+
+  is(inputFiles[0].name, "foo", "Input file name should be 'foo'");
+  is(inputFiles[1].name, "bar", "Input file name should be 'bar'");
+
+  is(inputFiles[0], input.files[0],
+     "Expect the same File object as input file 'foo'");
+  is(inputFiles[1], input.files[1],
+     "Expect the same File object as input file 'bar'");
+
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+window.addEventListener('load', runTest);
+
+</script>
+</pre>
+</body>
+</html>