1 files changed, 27 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-wrong-fetch.js b/devtools/client/debugger/test/mochitest/browser_dbg-wrong-fetch.js
new file mode 100644
index 0000000000..4ab5baeda4
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-wrong-fetch.js
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+// Test that incorrect source contents are not shown if the server refetches
+// different HTML when attaching to an open page.
+
+"use strict";
+
+add_task(async function () {
+  await addTab(`${EXAMPLE_URL}different_html.sjs`);
+
+  // This goop is here to manually clear the HTTP cache because setting response
+  // headers in different_html.sjs to not cache the response doesn't work.
+  Services.cache2.clear();
+
+  const toolbox = await openToolboxForTab(gBrowser.selectedTab, "jsdebugger");
+  const dbg = createDebuggerContext(toolbox);
+  await selectSource(dbg, "different_html.sjs");
+  await waitForLoadedSource(dbg, "different_html.sjs");
+  const contents = findSourceContent(dbg, "different_html.sjs");
+
+  ok(
+    contents.value.includes("Incorrect contents fetched"),
+    "Error message is shown"
+  );
+});