code: public static Matcher<MethodTree> constructorOfClass(final String className) {
      return new Matcher<MethodTree>() {
        @Override
        public boolean matches(MethodTree methodTree, VisitorState state) {
          Symbol symbol = ASTHelpers.getSymbol(methodTree);
          return symbol.getEnclosingElement().getQualifiedName().contentEquals(className)
              && symbol.isConstructor();
        }
      };
    }
docs: Matches a constructor declaration in a specific enclosing class.
  
  @param className The fully-qualified name of the enclosing class, e.g.
  "com.google.common.base.Preconditions"