public void IncorrectOperationNoRecognition()
        {
            var incorrectOperation = @"#";

            var provider = new BasicOperationProvider();

            Assert.False(provider.IsOperation(incorrectOperation));
        }
        public void AddOperationRecognition()
        {
            var operation = @"+";

            var provider = new BasicOperationProvider();

            Assert.True(provider.IsOperation(operation));
        }