add model binder tests.

test/DotNetCore.CAP.Test/ModelBinderFactoryTest.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Linq;
+using System.Reflection;
+using DotNetCore.CAP.Internal;
+using Xunit;
+
+namespace DotNetCore.CAP.Test
+{
+    public class ModelBinderFactoryTest
+    {
+        IModelBinderFactory _factory;
+
+        public ModelBinderFactoryTest()
+        {
+            _factory = new ModelBinderFactory();
+        }
+
+        [Theory]
+        [InlineData(nameof(Sample.DateTimeParam))]
+        [InlineData(nameof(Sample.StringParam))]
+        [InlineData(nameof(Sample.IntegerParam))]
+        [InlineData(nameof(Sample.GuidParam))]
+        [InlineData(nameof(Sample.UriParam))]
+        public void CreateSimpleTypeBinderTest(string methodName)
+        {
+            var datetimeMethod = typeof(Sample).GetRuntimeMethods().Single(x => x.Name == methodName);
+            var binder = _factory.CreateBinder(datetimeMethod.GetParameters()[0]);
+            Assert.NotNull(binder);
+            Assert.True(binder is SimpleTypeModelBinder);
+            Assert.False(binder is ComplexTypeModelBinder);
+        }
+
+        [Theory]
+        [InlineData(nameof(Sample.ComplexTypeParam))]
+        public void CreateComplexTypeBinderTest(string methodName)
+        {
+            var datetimeMethod = typeof(Sample).GetRuntimeMethods().Single(x => x.Name == methodName);
+            var binder = _factory.CreateBinder(datetimeMethod.GetParameters()[0]);
+            Assert.NotNull(binder);
+            Assert.False(binder is SimpleTypeModelBinder);
+            Assert.True(binder is ComplexTypeModelBinder);
+        }
+
+    }
+}

test/DotNetCore.CAP.Test/Sample.cs

+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DotNetCore.CAP.Test
+{
+    public class Sample
+    {
+
+        public void DateTimeParam(DateTime dateTime)
+        {
+
+        }
+
+        public void StringParam(string @string)
+        {
+
+        }
+
+        public void GuidParam(Guid guid)
+        {
+
+        }
+
+        public void UriParam(Uri uri)
+        {
+
+        }
+
+        public void IntegerParam(int @int)
+        {
+
+        }
+
+        public void ComplexTypeParam(ComplexType complexType)
+        {
+
+        }
+    }
+
+    public class ComplexType
+    {
+        public DateTime Time { get; set; }
+
+        public string String { get; set; }
+
+        public Guid Guid { get; set; }
+
+        public Person Person { get; set; }
+    }
+
+    public class Person
+    {
+        public int Age { get; set; }
+
+        public string Name { get; set; }
+    }
+}