1 files changed, 38 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg-react-app.js b/devtools/client/debugger/test/mochitest/browser_dbg-react-app.js
new file mode 100644
index 0000000000..2882bba1b6
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg-react-app.js
@@ -0,0 +1,38 @@
+/* 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/>. */
+
+"use strict";
+
+add_task(async function () {
+  await pushPref("devtools.debugger.map-scopes-enabled", true);
+  const dbg = await initDebugger("doc-react.html", "App.js");
+
+  await selectSource(dbg, "App.js");
+  await addBreakpoint(dbg, "App.js", 11);
+
+  info("Test previewing an immutable Map inside of a react component");
+  invokeInTab("clickButton");
+  await waitForPaused(dbg);
+
+  await waitForState(dbg, state =>
+    dbg.selectors.getSelectedScopeMappings(dbg.selectors.getCurrentThread())
+  );
+
+  await assertPreviews(dbg, [
+    {
+      line: 10,
+      column: 22,
+      expression: "fields",
+      fields: [["size", "1"]],
+    },
+  ]);
+
+  info("Verify that the file is flagged as a React module");
+  const sourceTab = findElementWithSelector(dbg, ".source-tab.active");
+  ok(
+    sourceTab.querySelector(".source-icon.react"),
+    "Source tab has a React icon"
+  );
+  assertSourceIcon(dbg, "App.js", "react");
+});