Added case-insensitive operators and started unit tests project

SieveUnitTests/Entities/Post.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Sieve.Attributes;
+
+namespace SieveUnitTests.Entities
+{
+    public class Post
+    {
+        public int Id { get; set; }
+
+        [Sieve(CanFilter = true, CanSort = true)]
+        public string Title { get; set; } = Guid.NewGuid().ToString().Replace("-", string.Empty).Substring(0, 8);
+
+        [Sieve(CanFilter = true, CanSort = true)]
+        public int LikeCount { get; set; } = new Random().Next(0, 1000);
+
+        [Sieve(CanFilter = true, CanSort = true)]
+        public int CommentCount { get; set; } = new Random().Next(0, 1000);
+
+        [Sieve(CanFilter = true, CanSort = true)]
+        public DateTimeOffset DateCreated { get; set; } = DateTimeOffset.UtcNow;
+    }
+}

SieveUnitTests/General.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Sieve.Models;
+using Sieve.Services;
+using SieveUnitTests.Entities;
+using SieveUnitTests.Services;
+using System;
+using System.Linq;
+using System.Collections.Generic;
+
+namespace SieveUnitTests
+{
+    [TestClass]
+    public class General
+    {
+        private SieveProcessor _processor;
+        private IQueryable<Post> _posts;
+
+        public General()
+        {
+            _processor = new SieveProcessor(new SieveOptionsAccessor(),
+                new SieveCustomSortMethods(),
+                new SieveCustomFilterMethods());
+
+            _posts = new List<Post>
+            {
+                new Post() {
+                    Id = 0,
+                    Title = "A",
+                    LikeCount = 100
+                },
+                new Post() {
+                    Id = 1,
+                    Title = "B",
+                    LikeCount = 50
+                },
+                new Post() {
+                    Id = 2,
+                    Title = "C",
+                    LikeCount = 0
+                },
+            }.AsQueryable();
+        }
+
+        [TestMethod]
+        public void ContainsCanBeCaseInsensitive()
+        {
+            var model = new SieveModel()
+            {
+                Filters = "Title@=*a"
+            };
+
+            var result = _processor.ApplyFiltering(model, _posts);
+
+            Assert.AreEqual(result.First().Id, 0);
+            Assert.IsTrue(result.Count() == 1);
+        }
+
+        [TestMethod]
+        public void ContainsIsCaseSensitive()
+        {
+            var model = new SieveModel()
+            {
+                Filters = "Title@=a",
+            };
+
+            var result = _processor.ApplyFiltering(model, _posts);
+
+            Assert.IsTrue(result.Count() == 0);
+        }
+
+        [TestMethod]
+        public void EqualsDoesntFailWithNonStringTypes()
+        {
+            var model = new SieveModel()
+            {
+                Filters = "LikeCount==50",
+            };
+
+            Console.WriteLine(model.FiltersParsed.First().Value);
+            Console.WriteLine(model.FiltersParsed.First().Operator);
+            Console.WriteLine(model.FiltersParsed.First().OperatorParsed);
+
+            var result = _processor.ApplyFiltering(model, _posts);
+
+
+
+            Assert.AreEqual(result.First().Id, 1);
+            Assert.IsTrue(result.Count() == 1);
+        }
+    }
+}
+
+//
+//Sorts = "LikeCount",
+//Page = 1,
+//PageSize = 10
+//

SieveUnitTests/Services/SieveCustomFilterMethods.cs

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+using Sieve.Services;
+using SieveUnitTests.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SieveUnitTests.Services
+{
+    public class SieveCustomFilterMethods : ISieveCustomFilterMethods
+    {
+        public IQueryable<Post> IsNew(IQueryable<Post> source, string op, string value)
+        {
+            var result = source.Where(p => p.LikeCount < 100 &&
+                                           p.CommentCount < 5);
+
+            return result;
+        }
+    }
+}

SieveUnitTests/Services/SieveCustomSortMethods.cs

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+using Sieve.Services;
+using SieveUnitTests.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace SieveUnitTests.Services
+{
+    public class SieveCustomSortMethods : ISieveCustomSortMethods
+    {
+        public IQueryable<Post> Popularity(IQueryable<Post> source, bool useThenBy, bool desc)
+        {
+            var result = useThenBy ?
+                ((IOrderedQueryable<Post>)source).ThenBy(p => p.LikeCount) :
+                source.OrderBy(p => p.LikeCount)
+                .ThenBy(p => p.CommentCount)
+                .ThenBy(p => p.DateCreated);
+
+            return result;
+        }
+    }
+}

SieveUnitTests/Services/SieveOptionsAccessor.cs

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+using Microsoft.Extensions.Options;
+using Sieve.Models;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SieveUnitTests
+{
+    public class SieveOptionsAccessor : IOptions<SieveOptions>
+    {
+        private SieveOptions _value;
+
+        public SieveOptions Value
+        {
+            get
+            {
+                return _value;
+            }
+        }
+
+        public SieveOptionsAccessor()
+        {
+            _value = new SieveOptions();
+        }
+    }
+}

SieveUnitTests/SieveUnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.5.0" />
+    <PackageReference Include="MSTest.TestAdapter" Version="1.2.0" />
+    <PackageReference Include="MSTest.TestFramework" Version="1.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Sieve\Sieve.csproj" />
+  </ItemGroup>
+
+</Project>