public void GetFilterExpression()
        {
            var a = FilterExpressionBuilder.CreateBuilder <IncludeExpressionTests.TestClass>(
                builder =>
            {
                builder.Add("b", FilterExpressionParameter.Create(f =>
                {
                    f.Operator       = Operator.And;
                    f.Value          = "Test";
                    f.ComparisonType = ComparisonType.Equal;
                }));
                builder.Add("a", FilterExpressionParameter.Create(f =>
                {
                    f.Operator       = Operator.Not;
                    f.Value          = "Test21321";
                    f.ComparisonType = ComparisonType.Contains;
                }));
                builder.Add("c", FilterExpressionParameter.Create(f =>
                {
                    f.Operator       = Operator.Or;
                    f.Value          = 64571;
                    f.ComparisonType = ComparisonType.LessThan;
                }));
            }).FilterExpression;

            Assert.IsAssignableFrom <Expression <Func <IncludeExpressionTests.TestClass, bool> > >(a);
        }
        public void GetFilterExpressionForNullable()
        {
            int?value = 4567;
            var a     = FilterExpressionBuilder.CreateBuilder <MyTestClass>(builder =>
            {
                builder.Add("a", FilterExpressionParameter.Create(fep =>
                {
                    fep.Value          = value;
                    fep.ComparisonType = ComparisonType.Equal;
                    fep.Operator       = Operator.Or;
                })).Add("b", FilterExpressionParameter.Create(fep =>
                {
                    fep.Value          = value;
                    fep.ComparisonType = ComparisonType.Equal;
                    fep.Operator       = Operator.Or;
                }));
            }).FilterExpression;

            Assert.IsAssignableFrom <Expression <Func <MyTestClass, bool> > >(a);
        }