Added tests

MiscTests/JoinPostGroupByTest.cs

@@ -45,7 +45,7 @@ from theDevice in emptyDevice.DefaultIfEmpty()
         }
 
         [Fact]
-        public void EfCoreTestLinqQuery_FailsTranslatingDefaultIfEmpty()
+        public void EfCoreTestLinqQuery_FailsTranslatingDefaultIfEmptyToSql()
         {
             base.EFContext(context => {
 
@@ -75,7 +75,7 @@ from theDevice in emptyDevice.DefaultIfEmpty()
         }
 
         [Fact]
-        public void EfCoreTestLinqQuery_Fails()
+        public void EfCoreTestLinqQuery_FailsWithInvalidSelectClause()
         {
             base.EFContext(context => {
 
@@ -105,5 +105,65 @@ from theDevice in emptyDevice.DefaultIfEmpty()
             });
         }
 
+        [Fact]
+        public void EfCoreTestLinqQuery_FailsWhenCountIsUsed()
+        {
+            base.EFContext(context => {
+
+                var q1 = from employee in context.Set<EFCore.Employee>()
+                         join device in context.Set<EFCore.EmployeeDevice>() on employee.Id equals device.EmployeeId into emptyDevice
+                         from theDevice in emptyDevice.DefaultIfEmpty()
+                         select new { employee.Id, theDevice.Device };
+
+                var q2 = from q in q1
+                         group q by new
+                         {
+                             q.Id,
+                         } into s
+                         select new
+                         {
+                             Id = s.Key.Id,
+                             DeviceCount = s.Count(a=> a.Device != null)
+                         };
+
+                var q3 = from q in q2
+                         join details in context.Set<EFCore.EmployeeDetails>() on q.Id equals details.EmployeeId
+                         select new { q.Id, details.Details };
+
+                var exception = Assert.Throws<InvalidOperationException>(() => q3.ToList());
+
+                Assert.Equal("Error generated for warning 'Microsoft.EntityFrameworkCore.Query.QueryClientEvaluationWarning: The LINQ expression 'GroupBy(new <>f__AnonymousType3`1(Id = [employee].Id), new <>f__AnonymousType6`2(Id = [employee].Id, Device = [theDevice]?.Device))' could not be translated and will be evaluated locally.'. This exception can be suppressed or logged by passing event ID 'RelationalEventId.QueryClientEvaluationWarning' to the 'ConfigureWarnings' method in 'DbContext.OnConfiguring' or 'AddDbContext'.", exception.Message);
+            });
+        }
+
+
+        [Fact]
+        public void EfCoreTestLinqQuery_FailsWithIndexOutOfRange()
+        {
+            base.EFContext(context => {
+
+                var q1 = from employee in context.Set<EFCore.Employee>()
+                         join device in context.Set<EFCore.EmployeeDevice>() on employee.Id equals device.EmployeeId into emptyDevice
+                         from theDevice in emptyDevice.DefaultIfEmpty()
+                         select new { employee.Id, theDevice.Device };
+
+                var q2 = from q in q1
+                         group q by new
+                         {
+                             q.Id,
+                         } into s
+                         select new
+                         {
+                             Id = s.Key.Id,
+                             DeviceCount = s.Count(a => a.Device != null)
+                         };
+
+                var q3 = from q in q2
+                         join details in context.Set<EFCore.EmployeeDetails>() on q.Id equals details.EmployeeId
+                         select new { q.Id, details };
+
+                var exception = Assert.Throws<IndexOutOfRangeException>(() => q3.ToList());
+            });
+        }
     }
 }