--- a/devtools/client/webconsole/new-console-output/test/fixtures/stub-generators/stub-snippets.js
+++ b/devtools/client/webconsole/new-console-output/test/fixtures/stub-generators/stub-snippets.js
@@ -146,15 +146,19 @@ pageError.set("Reference Error", `
   }
   function foo() {
     bar()
   }
 
   foo()
 `);
 
+pageError.set("Redeclaration Error", `
+  let a, a;
+`);
+
 module.exports = {
   consoleApi,
   cssMessage,
   evaluationResult,
   networkEvent,
   pageError,
 };