Creating test case for explicit expansion of a collection and its chi…

…ld reference.

src/IntegrationTests/ExplicitExpansion/ExpandCollections.cs

@@ -17,7 +17,7 @@ public class ExpandCollections : AutoMapperSpecBase
         protected override MapperConfiguration Configuration => new MapperConfiguration(cfg =>
         {
             cfg.CreateMap<Category, CategoryDto>();
-            cfg.CreateMap<TrainingCourse, TrainingCourseDto>().ForMember(c => c.Content, o => o.ExplicitExpansion());
+            cfg.CreateMap<TrainingCourse, TrainingCourseDto>();
             cfg.CreateMap<TrainingContent, TrainingContentDto>().ForMember(c => c.Category, o => o.ExplicitExpansion());
         });
 

src/IntegrationTests/ExplicitExpansion/ExplicitlyExpandCollectionsAndChildReferences.cs

@@ -0,0 +1,114 @@
+using AutoMapper.UnitTests;
+using Shouldly;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Data.Entity;
+using System.Diagnostics;
+using System.Linq;
+using Xunit;
+
+namespace AutoMapper.IntegrationTests.Net4
+{
+    public class ExplicitlyExpandCollectionsAndChildReferences : AutoMapperSpecBase
+    {
+        TrainingCourseDto _course;
+
+        protected override MapperConfiguration Configuration => new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Category, CategoryDto>();
+            cfg.CreateMap<TrainingCourse, TrainingCourseDto>().ForMember(c => c.Content, o => o.ExplicitExpansion());
+            cfg.CreateMap<TrainingContent, TrainingContentDto>().ForMember(c => c.Category, o => o.ExplicitExpansion());
+        });
+
+        protected override void Because_of()
+        {
+            using (var context = new ClientContext())
+            {
+                context.Database.Log = s => Trace.WriteLine(s);
+                _course = ProjectTo<TrainingCourseDto>(context.TrainingCourses, null, c => c.Content.Select(co => co.Category)).FirstOrDefault(n => n.CourseName == "Course 1");
+            }
+        }
+
+
+        [Fact]
+        public void Should_expand_collections_items()
+        {
+            _course.Content[0].Category.CategoryName.ShouldBe("Category 1");
+        }
+
+        class Initializer : DropCreateDatabaseAlways<ClientContext>
+        {
+            protected override void Seed(ClientContext context)
+            {
+                var category = new Category { CategoryName = "Category 1" };
+                var course = new TrainingCourse { CourseName = "Course 1" };
+                context.TrainingCourses.Add(course);
+                var content = new TrainingContent { ContentName = "Content 1", Category = category };
+                context.TrainingContents.Add(content);
+                course.Content.Add(content);
+            }
+        }
+
+        class ClientContext : DbContext
+        {
+            public ClientContext()
+            {
+                Database.SetInitializer(new Initializer());
+            }
+            public DbSet<Category> Categories { get; set; }
+            public DbSet<TrainingCourse> TrainingCourses { get; set; }
+            public DbSet<TrainingContent> TrainingContents { get; set; }
+        }
+
+        public class TrainingCourse
+        {
+            [Key]
+            public int CourseId { get; set; }
+
+            public string CourseName { get; set; }
+
+            public virtual IList<TrainingContent> Content { get; set; } = new List<TrainingContent>();
+        }
+
+        public class TrainingContent
+        {
+            [Key]
+            public int ContentId { get; set; }
+
+            public string ContentName { get; set; }
+
+            public Category Category { get; set; }
+        }
+
+        public class Category
+        {
+            public int CategoryId { get; set; }
+            public string CategoryName { get; set; }
+        }
+
+
+        public class TrainingCourseDto
+        {
+            public int CourseId { get; set; }
+
+            public string CourseName { get; set; }
+
+            public virtual IList<TrainingContentDto> Content { get; set; }
+        }
+
+        public class CategoryDto
+        {
+            public int CategoryId { get; set; }
+            public string CategoryName { get; set; }
+        }
+
+        public class TrainingContentDto
+        {
+            public int ContentId { get; set; }
+
+            public string ContentName { get; set; }
+
+            public CategoryDto Category { get; set; }
+        }
+    }
+}