add unit test

asm-util/src/test/java/org/objectweb/asm/util/CheckClassAdapterTest.java

@@ -340,6 +340,17 @@ public class CheckClassAdapterTest extends AsmTest implements Opcodes {
     assertEquals("<T::LI.J<*+LA;>;>()V^LA;X: error at index 24", exception.getMessage());
   }
 
+  @Test
+  public void testVisitMethod_legal() {
+    CheckClassAdapter checkClassAdapter = new CheckClassAdapter(null);
+    checkClassAdapter.visit(V1_1, ACC_PUBLIC, "C", null, "java/lang/Object", null);
+    MethodVisitor mv = checkClassAdapter.visitMethod(ACC_PUBLIC, "m", "()V", null, null);
+    mv.visitCode();
+    mv.visitInsn(Opcodes.RETURN);
+    mv.visitMaxs(0, 1);
+    mv.visitEnd();
+  }
+
   @Test
   public void testVisitTypeAnnotation_illegalAnnotation1() {
     CheckClassAdapter checkClassAdapter = new CheckClassAdapter(null);