1 files changed, 49 insertions, 0 deletions
diff --git a/dom/security/test/general/file_loads_nonscript.html b/dom/security/test/general/file_loads_nonscript.html
new file mode 100644
index 0000000000..f7692b8066
--- /dev/null
+++ b/dom/security/test/general/file_loads_nonscript.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>File that loads a non-script file-extension as script</title>
+</head>
+<body>
+  <script>
+    /* global equal */
+
+    const files = ["file_nonscript",
+                   "file_nonscript.xyz",
+                   "file_nonscript.html",
+                   "file_nonscript.txt",
+                   "file_nonscript.json"];
+
+    async function run() {
+      window.counter = 0;
+
+      for (let file of files) {
+        let script = document.createElement("script");
+        let promise = new Promise((resolve, reject) => {
+          script.addEventListener("error", resolve, {once: true});
+          script.addEventListener("load", reject, {once: true});
+        });
+        script.src = file;
+        document.body.append(script);
+
+        let event = await promise;
+        equal(event.type, "error");
+        equal(window.counter, 0);
+      }
+
+      let script = document.createElement("script");
+      let promise = new Promise((resolve, reject) => {
+        script.addEventListener("load", resolve, {once: true});
+        script.addEventListener("error", reject, {once: true});
+      });
+      script.src = "file_script.js";
+      document.body.append(script);
+
+      let event = await promise;
+      equal(event.type, "load");
+      equal(window.counter, 1);
+
+      window.postMessage("done", "*");
+    }
+    window.addEventListener("message", run, {once: true})
+  </script>
+</html>