test that exception is thrown for different types

Author: maschmi

test/System.Linq.Dynamic.Core.Tests/QueryableTests.GroupJoin.cs

@@ -1,5 +1,7 @@
 using System.Collections.Generic;
+using System.Linq.Dynamic.Core.Exceptions;
 using System.Linq.Dynamic.Core.Tests.Helpers.Models;
+using NFluent;
 using Xunit;
 
 namespace System.Linq.Dynamic.Core.Tests
@@ -152,5 +154,21 @@ public void GroupJoinOnNullableType_LeftNullable()
                 }
             }
         }
+
+        [Fact]
+        public void GroupJoinOnNullableType_NotSameTypesThrowsException()
+        {
+            var person = new Person { Id = 1, Name = "Hedlund, Magnus" };
+            var people = new List<Person> { person };
+            var pets = new List<Pet> { new Pet { Name = "Daisy", OwnerId = person.Id } };
+
+            Check.ThatCode(() =>
+                people.AsQueryable()
+                    .GroupJoin(
+                        pets,
+                        "it.Id",
+                        "Name", // This is wrong
+                        "new(outer.Name as OwnerName, inner as Pets)")).Throws<ParseException>();
+        }
     }
 }