public void Apply_BadValue_ReturnsNull()
        {
            filter.Method = "equals";
            filter.Values = new[] { "Test" };

            Assert.Null(filter.Apply(booleanExpression.Body));
        }
        public void Apply_OnInvalidBooleanValueReturnsNull()
        {
            Expression <Func <GridModel, Boolean> > expression = (model) => model.IsChecked;

            filter.Value = "Test";

            Assert.Null(filter.Apply(expression.Body));
        }