add unit tests for LocalVariableAttribute.variableNameByIndex and MethodParametersAttribute.parameterName

src/main/javassist/bytecode/LocalVariableAttribute.java

@@ -227,7 +227,7 @@ public class LocalVariableAttribute extends AttributeInfo {
     public String variableNameByIndex(int index) {
         for (int i = 0; i < tableLength(); i++) {
             if (index(i) == index) {
-                return getConstPool().getUtf8Info(nameIndex(i));
+                return variableName(i);
             }
         }
         throw new ArrayIndexOutOfBoundsException();

src/test/javassist/JvstTest4.java

@@ -1019,11 +1019,15 @@ public class JvstTest4 extends JvstTestRoot {
         assertEquals(2, attr.size());
         assertEquals("i", cp.getUtf8Info(attr.name(0)));
         assertEquals("s", cp.getUtf8Info(attr.name(1)));
+        assertEquals("i", attr.parameterName(0));
+        assertEquals("s", attr.parameterName(1));
 
         attr = (MethodParametersAttribute)attr.copy(cp, null);
         assertEquals(2, attr.size());
         assertEquals("i", cp.getUtf8Info(attr.name(0)));
         assertEquals("s", cp.getUtf8Info(attr.name(1)));
+        assertEquals("i", attr.parameterName(0));
+        assertEquals("s", attr.parameterName(1));
     }
 
     // JIRA JASSIST-220

src/test/javassist/bytecode/BytecodeTest.java

@@ -354,6 +354,9 @@ public class BytecodeTest extends TestCase {
                 assertEquals("I", ainfo2.descriptor(i));
         }
         print("**** end ***");
+
+        assertEquals("this", ainfo2.variableNameByIndex(0));
+        assertEquals("i", ainfo2.variableNameByIndex(1));
     }
 
     public void testAnnotations() throws Exception {