1 files changed, 20 insertions, 0 deletions
diff --git a/devtools/client/debugger/test/mochitest/examples/script-mutate.js b/devtools/client/debugger/test/mochitest/examples/script-mutate.js
new file mode 100644
index 0000000000..c47a523d60
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/examples/script-mutate.js
@@ -0,0 +1,20 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+function mutate() {
+  const phonebook = {
+    S: {
+      sarah: {
+        lastName: "Doe"
+      },
+      serena: {
+        lastName: "Williams"
+      }
+    }
+  };
+
+  debugger;
+  phonebook.S.sarah.lastName = "Pierce";
+  debugger;
+  phonebook.S.sarah.timezone = "PST";
+  debugger;
+}