
As a fault localization tool, your objective is to identify potential buggy lines within a specific method. The bug was triggered by the test case "org.jfree.chart.imagemap.junit.StandardToolTipTagFragmentGeneratorTests::testGenerateURLFragment" and resulted in the following error message: "junit.framework.ComparisonFailure: expected:< title="Series [&quot;A&quot;], 100.0" alt=""> but was:< title="Series ["A"], 100.0" alt="">".
To assist you in debugging, the methods that requires attention are:
// Method 0 
1 public String generateToolTipFragment(String toolTipText) {
2         return " title=\"" + toolTipText
3             + "\" alt=\"\"";
4     }

Based on the provided context, please provide a concise and precise response containing the potential buggy lines in the following format: (line number: source code).
 Respond with more than 500 words.
user