diff --git a/src/DocoptNet/CodeGeneration/SourceGenerator.cs b/src/DocoptNet/CodeGeneration/SourceGenerator.cs
index 0fd1b8bd..05054fcd 100644
--- a/src/DocoptNet/CodeGeneration/SourceGenerator.cs
+++ b/src/DocoptNet/CodeGeneration/SourceGenerator.cs
@@ -252,7 +252,9 @@ static void Generate(CSharpSourceBuilder code,
 
             const string usageConstName = "Usage";
 
-            code["#nullable enable"].NewLine
+            code["// <auto-generated/>"].NewLine
+                .NewLine
+                ["#nullable enable"].NewLine
 
                 .NewLine
                 .Using("System.Collections")
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace1.ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace1.ProgramArguments.cs
index fe39c827..d4c2030c 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace1.ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace1.ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace2.ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace2.ProgramArguments.cs
index 6ee69de7..1314fd60 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace2.ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/Namespace2.ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/ProgramArguments.cs
index 92b9d479..585b86c6 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_from_different_namespaces_share_the_same_name/ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace1.ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace1.ProgramArguments.cs
index fe39c827..d4c2030c 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace1.ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace1.ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace2.ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace2.ProgramArguments.cs
index 6ee69de7..1314fd60 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace2.ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_classes_in_separate_files/Namespace2.ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage/Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage/Arguments.cs
index 2a553a69..c1d32b94 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage/Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage/Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage_with_custom_const_name/Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage_with_custom_const_name/Arguments.cs
index 1160c03a..e3613df4 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage_with_custom_const_name/Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_inline_usage_with_custom_const_name/Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments1.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments1.cs
index 0b67b014..94452d4c 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments1.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments1.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments2.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments2.cs
index 202b7f4e..d02774b2 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments2.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments2.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments3.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments3.cs
index 3d6c89d1..30c21635 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments3.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments3.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments4.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments4.cs
index a4ac8a25..ca8880a5 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments4.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments4.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments5.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments5.cs
index 65ea7d05..50c70462 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments5.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments5.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments6.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments6.cs
index 6a71c4ad..3d201f14 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments6.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments6.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments7.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments7.cs
index 521836a9..96247e2c 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments7.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments7.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments8.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments8.cs
index d1dd499a..a9f8d9f3 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments8.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_multiple_inline_usages/Arguments8.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/MyConsoleApp.Program-Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/MyConsoleApp.Program-Arguments.cs
index 0261e17d..ddd1af95 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/MyConsoleApp.Program-Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/MyConsoleApp.Program-Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Arguments.cs
index 1f3456f4..b8c60031 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Nested-Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Nested-Arguments.cs
index ce35a850..cd49a05e 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Nested-Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_args_class/Program-Nested-Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_namespace/Outer.Inner.Arguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_namespace/Outer.Inner.Arguments.cs
index c28d3a63..c5bf0b8b 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_namespace/Outer.Inner.Arguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_nested_namespace/Outer.Inner.Arguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_usage_in_external_file/ProgramArguments.cs b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_usage_in_external_file/ProgramArguments.cs
index 5b3e96cb..5f10428b 100644
--- a/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_usage_in_external_file/ProgramArguments.cs
+++ b/tests/DocoptNet.Tests/CodeGeneration/SourceGeneratorTests/Generate_with_usage_in_external_file/ProgramArguments.cs
@@ -1,3 +1,5 @@
+// <auto-generated/>
+
 #nullable enable
 
 using System.Collections;
diff --git a/tests/Integration/.editorconfig b/tests/Integration/.editorconfig
new file mode 100644
index 00000000..46446e47
--- /dev/null
+++ b/tests/Integration/.editorconfig
@@ -0,0 +1,5 @@
+[*.cs]
+dotnet_analyzer_diagnostic.category-Style.severity = warning
+
+# IDE0055: Fix formatting
+dotnet_diagnostic.IDE0055.severity = suggestion
diff --git a/tests/Integration/DocoptNet.Tests.Integration.csproj b/tests/Integration/DocoptNet.Tests.Integration.csproj
index 06a2fbce..b624de3a 100644
--- a/tests/Integration/DocoptNet.Tests.Integration.csproj
+++ b/tests/Integration/DocoptNet.Tests.Integration.csproj
@@ -5,6 +5,10 @@
     <IsPackable>false</IsPackable>
     <RestoreAdditionalProjectSources>$(MSBuildThisFileDirectory)..\..\dist</RestoreAdditionalProjectSources>
     <RestorePackagesPath>$(MSBuildThisFileDirectory).nuget</RestorePackagesPath>
+    <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
+    <!-- Workaround for IDE0005 (Remove unnecessary usings/imports); see https://github.com/dotnet/roslyn/issues/41640 -->
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <NoWarn>$(NoWarn);CS1591</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>