Bug 1315242 - Part 3: Add a test input for syntax error in Evaluation Result. r=bgrins

devtools/client/webconsole/new-console-output/test/fixtures/stub-generators/stub-snippets.js

@@ -92,7 +92,8 @@ console.log(
 // Evaluation Result
 const evaluationResultCommands = [
   "new Date(0)",
-  "asdf()"
+  "asdf()",
+  "1 + @"
 ];
 
 let evaluationResult = new Map(evaluationResultCommands.map(cmd => [cmd, cmd]));