Query: Add split query tests in TPT relationship tests

Resolves #21510

test/EFCore.Relational.Specification.Tests/Query/InheritanceRelationshipsQueryRelationalTestBase.cs

@@ -0,0 +1,228 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System.Linq;
+using Microsoft.EntityFrameworkCore.TestModels.InheritanceRelationships;
+using Xunit;
+
+namespace Microsoft.EntityFrameworkCore.Query
+{
+    public abstract class InheritanceRelationshipsQueryRelationalTestBase<TFixture> : InheritanceRelationshipsQueryTestBase<TFixture>
+        where TFixture : InheritanceRelationshipsQueryRelationalFixture, new()
+    {
+        public InheritanceRelationshipsQueryRelationalTestBase(TFixture fixture)
+            : base(fixture)
+        {
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.BaseCollectionOnBase);
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+            Assert.Equal(
+                3, result.SelectMany(e => e.BaseCollectionOnBase.OfType<DerivedCollectionOnBase>()).Count(e => e.DerivedProperty != 0));
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseCollectionsOnBase.Include(e => e.BaseParent);
+            var result = query.ToList();
+
+            Assert.Equal(13, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_with_filter_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.BaseCollectionOnBase).Where(e => e.Name != "Bar");
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+            Assert.Equal(
+                3, result.SelectMany(e => e.BaseCollectionOnBase.OfType<DerivedCollectionOnBase>()).Count(e => e.DerivedProperty != 0));
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_with_filter_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseCollectionsOnBase.Include(e => e.BaseParent).Where(e => e.Name != "Bar");
+            var result = query.ToList();
+
+            Assert.Equal(13, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_without_inheritance_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.CollectionOnBase);
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_without_inheritance_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.CollectionsOnBase.Include(e => e.Parent);
+            var result = query.ToList();
+
+            Assert.Equal(9, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_without_inheritance_with_filter_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.CollectionOnBase).Where(e => e.Name != "Bar");
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_without_inheritance_with_filter_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.CollectionsOnBase.Include(e => e.Parent).Where(e => e.Name != "Bar");
+            var result = query.ToList();
+
+            Assert.Equal(9, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_on_derived1_split()
+        {
+            using var context = CreateContext();
+            var query = context.DerivedEntities.Include(e => e.BaseCollectionOnBase);
+            var result = query.ToList();
+
+            Assert.Equal(3, result.Count);
+            Assert.Equal(
+                2, result.SelectMany(e => e.BaseCollectionOnBase.OfType<DerivedCollectionOnBase>()).Count(e => e.DerivedProperty != 0));
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_on_derived2_split()
+        {
+            using var context = CreateContext();
+            var query = context.DerivedEntities.Include(e => e.BaseCollectionOnDerived);
+            var result = query.ToList();
+
+            Assert.Equal(3, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_on_derived3_split()
+        {
+            using var context = CreateContext();
+            var query = context.DerivedEntities.Include(e => e.DerivedCollectionOnDerived);
+            var result = query.ToList();
+
+            Assert.Equal(3, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Include_collection_with_inheritance_on_derived_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseCollectionsOnDerived.Include(e => e.BaseParent);
+            var result = query.ToList();
+
+            Assert.Equal(7, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_reference_collection_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.BaseReferenceOnBase.NestedCollection);
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_reference_collection_on_base_split()
+        {
+            using var context = CreateContext();
+            var query = context.DerivedEntities.Include(e => e.BaseReferenceOnBase.NestedCollection);
+            var result = query.ToList();
+
+            Assert.Equal(3, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_reference_collection_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.NestedCollections.Include(e => e.ParentReference.BaseParent);
+            var result = query.ToList();
+
+            Assert.Equal(13, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_collection_reference_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.BaseCollectionOnBase).ThenInclude(e => e.NestedReference);
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+            Assert.Equal(
+                3, result.SelectMany(e => e.BaseCollectionOnBase.OfType<DerivedCollectionOnBase>()).Count(e => e.DerivedProperty != 0));
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_collection_reference_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.NestedReferences.Include(e => e.ParentCollection.BaseParent);
+            var result = query.ToList();
+
+            Assert.Equal(9, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_collection_collection_split()
+        {
+            using var context = CreateContext();
+            var query = context.BaseEntities.Include(e => e.BaseCollectionOnBase).ThenInclude(e => e.NestedCollection);
+            var result = query.ToList();
+
+            Assert.Equal(6, result.Count);
+            Assert.Equal(
+                3, result.SelectMany(e => e.BaseCollectionOnBase.OfType<DerivedCollectionOnBase>()).Count(e => e.DerivedProperty != 0));
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_with_inheritance_collection_collection_reverse_split()
+        {
+            using var context = CreateContext();
+            var query = context.NestedCollections.Include(e => e.ParentCollection.BaseParent);
+            var result = query.ToList();
+
+            Assert.Equal(13, result.Count);
+        }
+
+        [ConditionalFact]
+        public virtual void Nested_include_collection_reference_on_non_entity_base_split()
+        {
+            using var context = CreateContext();
+            var query = context.ReferencedEntities.Include(e => e.Principals).ThenInclude(e => e.Reference);
+            var result = query.ToList();
+
+            Assert.Equal(2, result.Count);
+        }
+    }
+}

test/EFCore.Relational.Specification.Tests/Query/TPTRelationshipsQueryTestBase.cs

@@ -1,12 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using Xunit;
-
 // ReSharper disable InconsistentNaming
 namespace Microsoft.EntityFrameworkCore.Query
 {
-    public abstract class TPTRelationshipsQueryTestBase<TFixture> : InheritanceRelationshipsQueryTestBase<TFixture>
+    public abstract class TPTRelationshipsQueryTestBase<TFixture> : InheritanceRelationshipsQueryRelationalTestBase<TFixture>
         where TFixture : TPTRelationshipsQueryRelationalFixture, new()
     {
         protected TPTRelationshipsQueryTestBase(TFixture fixture)