1 files changed, 20 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_webconsole_non_javascript_mime_warning.js b/devtools/client/webconsole/test/browser/browser_webconsole_non_javascript_mime_warning.js
new file mode 100644
index 0000000000..5374ee340d
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_webconsole_non_javascript_mime_warning.js
@@ -0,0 +1,20 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that <script> loads with non-JavaScript MIME types produce a warning.
+// See Bug 1510223.
+
+"use strict";
+
+const TEST_URI =
+  "https://example.com/browser/devtools/client/webconsole/" +
+  "test/browser/" +
+  "test-non-javascript-mime.html";
+const MIME_WARNING_MSG =
+  "The script from “https://example.com/browser/devtools/client/webconsole/test/browser/test-non-javascript-mime.js” was loaded even though its MIME type (“text/plain”) is not a valid JavaScript MIME type";
+
+add_task(async function () {
+  const hud = await openNewTabAndConsole(TEST_URI);
+  await waitFor(() => findWarningMessage(hud, MIME_WARNING_MSG), "", 100);
+  ok(true, "MIME type warning displayed");
+});