diff --git a/Exemples_coreOnly.sln b/Exemples_coreOnly.sln
index 90d6fec..5e4c751 100644
--- a/Exemples_coreOnly.sln
+++ b/Exemples_coreOnly.sln
@@ -577,6 +577,12 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ex_042_015_OneToMany_conven
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ex_042_016_OneToMany_FluentAPI", "p08_BDD_EntityFramework\ex_042_016_OneToMany_FluentAPI\ex_042_016_OneToMany_FluentAPI.csproj", "{9C2D4443-635F-4BA7-9870-9705BAD534EF}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "chap026_UnitTests", "chap026_UnitTests", "{53D9CC81-18E0-482C-953D-F2ED8B0C472D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ex_026_000_ClassLibrary", "p05_More_dotNet\ex_026_000_ClassLibrary\ex_026_000_ClassLibrary.csproj", "{A7B99201-30D6-498A-AC40-43662373D457}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ex_026_001_xUnit_Fact", "p05_More_dotNet\ex_026_001_xUnit_Fact\ex_026_001_xUnit_Fact.csproj", "{6BDA111C-227C-4F61-A466-EE7D5901B1BF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -4743,6 +4749,46 @@ Global
 		{9C2D4443-635F-4BA7-9870-9705BAD534EF}.Release|x64.Build.0 = Release|Any CPU
 		{9C2D4443-635F-4BA7-9870-9705BAD534EF}.Release|x86.ActiveCfg = Release|Any CPU
 		{9C2D4443-635F-4BA7-9870-9705BAD534EF}.Release|x86.Build.0 = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|ARM.Build.0 = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|ARM64.ActiveCfg = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|ARM64.Build.0 = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|x64.Build.0 = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Debug|x86.Build.0 = Debug|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|ARM.ActiveCfg = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|ARM.Build.0 = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|ARM64.ActiveCfg = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|ARM64.Build.0 = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|x64.ActiveCfg = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|x64.Build.0 = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|x86.ActiveCfg = Release|Any CPU
+		{A7B99201-30D6-498A-AC40-43662373D457}.Release|x86.Build.0 = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|ARM.Build.0 = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|ARM64.ActiveCfg = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|ARM64.Build.0 = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|x64.Build.0 = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Debug|x86.Build.0 = Debug|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|ARM.ActiveCfg = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|ARM.Build.0 = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|ARM64.ActiveCfg = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|ARM64.Build.0 = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|x64.ActiveCfg = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|x64.Build.0 = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|x86.ActiveCfg = Release|Any CPU
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -5014,6 +5060,9 @@ Global
 		{BE5CC150-CBCA-4E5F-BC7B-4F4A8E93380C} = {C7672736-AA73-4B7E-B5C6-A7A984216372}
 		{C85BE497-5BA9-4D7E-93EF-8F44E06DFDBC} = {C7672736-AA73-4B7E-B5C6-A7A984216372}
 		{9C2D4443-635F-4BA7-9870-9705BAD534EF} = {C7672736-AA73-4B7E-B5C6-A7A984216372}
+		{53D9CC81-18E0-482C-953D-F2ED8B0C472D} = {FBF49939-ACAD-4B71-AC29-14102ED6DB45}
+		{A7B99201-30D6-498A-AC40-43662373D457} = {53D9CC81-18E0-482C-953D-F2ED8B0C472D}
+		{6BDA111C-227C-4F61-A466-EE7D5901B1BF} = {53D9CC81-18E0-482C-953D-F2ED8B0C472D}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {8D31C3AE-36FF-4667-A2A7-0E670245A59E}