public ExpectationScope()
        {
            this.scopeStack        = new Stack <ChildScope>();
            this.mockNames         = new HashSet <string>();
            this.invocationHistory = new InvocationHistory();

            scopeStack.Push(new UnorderedChildScope(null));
        }
 internal ExpectationsException(IInvocationHistory invocationHistory, string format, params object[] args)
     : this(FormatMessage(invocationHistory, format, args))
 {
 }