Add test verifying #15208

DateTimeOffset and Contains()

Fixes #15208

test/EFCore.SqlServer.FunctionalTests/Query/QueryBugsTest.cs

@@ -5617,6 +5617,60 @@ public class Reference16233
 
         #endregion
 
+        #region Bug15208
+
+        [ConditionalFact]
+        public virtual void Contains_DateTimeOffset()
+        {
+            using (CreateDatabase15208())
+            {
+                using (var context = new MyContext15208(_options))
+                {
+                    var dto = new DateTimeOffset(2019, 1, 1, 1, 1, 1, TimeSpan.Zero);
+                    var (start, end) = (dto.AddDays(-1), dto.AddDays(1));
+                    var dates = new List<DateTimeOffset> { dto };
+                    var blog = context.Blogs
+                        .Single(b =>
+                            start <= b.PublicationDate.Date &&
+                            b.PublicationDate < end &&
+                            dates.Contains(b.PublicationDate));
+                    Assert.Equal(1, blog.Id);
+                }
+            }
+        }
+
+        private SqlServerTestStore CreateDatabase15208()
+            => CreateTestStore(
+                () => new MyContext15208(_options),
+                context =>
+                {
+                    ClearLog();
+                });
+
+        public class MyContext15208 : DbContext
+        {
+            public DbSet<Blog> Blogs { get; set; }
+
+            public MyContext15208(DbContextOptions options) : base(options) {}
+
+            protected override void OnModelCreating(ModelBuilder modelBuilder)
+            {
+                modelBuilder.Entity<Blog>().HasData(new Blog
+                {
+                    Id = 1,
+                    PublicationDate = new DateTimeOffset(2019, 1, 1, 1, 1, 1, TimeSpan.Zero)
+                });
+            }
+        }
+
+        public class Blog
+        {
+            public int Id { get; set; }
+            public DateTimeOffset PublicationDate { get; set; }
+        }
+
+        #endregion Bug15208
+
         private DbContextOptions _options;
 
         private SqlServerTestStore CreateTestStore<TContext>(