Add license banner to source. (#59586)

51 files changed, 194 insertions, 45 deletions

diff --git a/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/MarshalEx.cs b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/MarshalEx.cs
index 4260b311ac0..8bd0b2fd564 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/MarshalEx.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/MarshalEx.cs
@@ -1,3 +1,5 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/SpanMarshallers.cs b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/SpanMarshallers.cs
index dccfa6a23ad..453259feeda 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/SpanMarshallers.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/Ancillary.Interop/SpanMarshallers.cs
@@ -1,3 +1,5 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
@@ -390,4 +392,4 @@ namespace System.Runtime.InteropServices.GeneratedMarshalling
             Marshal.FreeCoTaskMem((IntPtr)_allocatedMemory);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/ArrayTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/ArrayTests.cs
index 9e885fb4177..fcdedc6ba00 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/ArrayTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/ArrayTests.cs
@@ -1,4 +1,7 @@
-using SharedTypes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using SharedTypes;
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BlittableStructTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BlittableStructTests.cs
index a6a32324495..5aa24bf1af9 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BlittableStructTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BlittableStructTests.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 using SharedTypes;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BooleanTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BooleanTests.cs
index 40dbb9f1a65..063174d3e35 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BooleanTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/BooleanTests.cs
@@ -1,4 +1,7 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
 using Xunit;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CallingConventionTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CallingConventionTests.cs
index 6e8d702b8b5..161b94f8c39 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CallingConventionTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CallingConventionTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.CompilerServices;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CharacterTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CharacterTests.cs
index 432f05f5482..3443a5df2bb 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CharacterTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CharacterTests.cs
@@ -1,4 +1,7 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
 using Xunit;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CollectionTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CollectionTests.cs
index 7effc5f3f98..4a08b3f79d2 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CollectionTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CollectionTests.cs
@@ -1,4 +1,7 @@
-using SharedTypes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using SharedTypes;
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/Constants.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/Constants.cs
index 8c5a2812d08..9ea08ea2fe8 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/Constants.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/Constants.cs
@@ -1,7 +1,10 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 namespace DllImportGenerator.IntegrationTests
 {
     partial class NativeExportsNE
     {
         public const string NativeExportsNE_Binary = "Microsoft.Interop.Tests." + nameof(NativeExportsNE);
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CustomMarshallingTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CustomMarshallingTests.cs
index a52aae7029e..134bf872565 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CustomMarshallingTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/CustomMarshallingTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 using System.Text;
 using SharedTypes;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/DelegateTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/DelegateTests.cs
index 72160892d97..01f86616972 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/DelegateTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/DelegateTests.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 using Xunit;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/EnumTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/EnumTests.cs
index d39b3805abc..8002e260998 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/EnumTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/EnumTests.cs
@@ -1,4 +1,7 @@
-using System.Collections.Generic;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
 using Xunit;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/FunctionPointerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/FunctionPointerTests.cs
index 9de487153f7..f083c24f413 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/FunctionPointerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/FunctionPointerTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PointerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PointerTests.cs
index 8a15c7ce36e..463ea434d36 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PointerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PointerTests.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 using SharedTypes;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PreserveSigTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PreserveSigTests.cs
index 079f1d17bb9..ee1f351e66f 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PreserveSigTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/PreserveSigTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 using Xunit;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SafeHandleTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SafeHandleTests.cs
index fda3852b3d8..96c21224e9d 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SafeHandleTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SafeHandleTests.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System.Runtime.InteropServices;
 
 using Microsoft.Win32.SafeHandles;
@@ -98,4 +101,4 @@ namespace DllImportGenerator.IntegrationTests
             handle.Dispose();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SetLastErrorTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SetLastErrorTests.cs
index 6d6dca8cb87..d6b3cac367c 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SetLastErrorTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SetLastErrorTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 using Xunit;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SpanTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SpanTests.cs
index 53421dbc47d..ad61c89cf0d 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SpanTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/SpanTests.cs
@@ -1,4 +1,7 @@
-using SharedTypes;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using SharedTypes;
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/StringTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/StringTests.cs
index cb2b9cb6853..db99bf81a8b 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/StringTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.Tests/StringTests.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AdditionalAttributesOnStub.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AdditionalAttributesOnStub.cs
index 0c0fe9a646b..83872bdad7e 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AdditionalAttributesOnStub.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AdditionalAttributesOnStub.cs
@@ -1,4 +1,7 @@
-using Microsoft.CodeAnalysis;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Testing;
 using System;
 using System.Collections.Generic;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AttributeForwarding.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AttributeForwarding.cs
index 2c926a81303..959a6402dda 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AttributeForwarding.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/AttributeForwarding.cs
@@ -1,4 +1,7 @@
-using Microsoft.CodeAnalysis;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using System;
 using System.Collections.Generic;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CodeSnippets.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CodeSnippets.cs
index c35615cea11..746646fd523 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CodeSnippets.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CodeSnippets.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 namespace DllImportGenerator.UnitTests
 {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CompileFails.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CompileFails.cs
index f121725e793..30895d04149 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CompileFails.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/CompileFails.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.InteropServices;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
index 959e4005e30..a49ac3a06c5 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using Microsoft.CodeAnalysis;
 using System;
 using System.Collections.Generic;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportAnalyzerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportAnalyzerTests.cs
index 2f7b0efc796..45cd06a401c 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportAnalyzerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportAnalyzerTests.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportFixerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportFixerTests.cs
index fe4a101f2ee..5ac4063756c 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportFixerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ConvertToGeneratedDllImportFixerTests.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
@@ -364,4 +367,4 @@ partial class Test
                 usePreprocessorDefines ? WithPreprocessorDefinesKey : NoPreprocessorDefinesKey);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
index 8aa83bae201..df6da900869 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGeneratorOptionsProvider.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGeneratorOptionsProvider.cs
index a774bd2ef35..8459d2fd442 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGeneratorOptionsProvider.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/DllImportGeneratorOptionsProvider.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
@@ -68,4 +71,4 @@ namespace DllImportGenerator.UnitTests
             public static AnalyzerConfigOptions Instance = new EmptyOptions();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/GeneratedDllImportAnalyzerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/GeneratedDllImportAnalyzerTests.cs
index 63c5497902e..6aae75c8c5a 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/GeneratedDllImportAnalyzerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/GeneratedDllImportAnalyzerTests.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System.Threading.Tasks;
 using Xunit;
 using static Microsoft.Interop.Analyzers.GeneratedDllImportAnalyzer;
@@ -190,4 +193,4 @@ using System.Runtime.InteropServices;
                     .WithArguments("Test"));
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/IncrementalGenerationTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/IncrementalGenerationTests.cs
index 89269066b49..75e5de8f546 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/IncrementalGenerationTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/IncrementalGenerationTests.cs
@@ -1,4 +1,7 @@
-using Microsoft.CodeAnalysis;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Text;
 using System;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ManualTypeMarshallingAnalyzerTests.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ManualTypeMarshallingAnalyzerTests.cs
index d82b84c9bb1..dc8981b28c4 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ManualTypeMarshallingAnalyzerTests.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/ManualTypeMarshallingAnalyzerTests.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Testing;
 using System.Collections.Generic;
@@ -1511,4 +1514,4 @@ struct Native
                 VerifyCS.Diagnostic(StackallocConstructorMustHaveStackBufferSizeConstantRule).WithLocation(0).WithArguments("Native"));
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/TestUtils.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/TestUtils.cs
index db7b0f3fecc..41e52104f16 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/TestUtils.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/TestUtils.cs
@@ -1,4 +1,7 @@
-using Microsoft.CodeAnalysis;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Diagnostics;
 using Microsoft.CodeAnalysis.Testing;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpAnalyzerVerifier.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpAnalyzerVerifier.cs
index bb0a07677ca..bd54db652e4 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpAnalyzerVerifier.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpAnalyzerVerifier.cs
@@ -1,3 +1,5 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Threading;
 using System.Threading.Tasks;
@@ -40,4 +42,4 @@ namespace DllImportGenerator.UnitTests.Verifiers
         internal class Test : CSharpCodeFixVerifier<TAnalyzer, EmptyCodeFixProvider>.Test
         { }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpCodeFixVerifier.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpCodeFixVerifier.cs
index 9074cc753c1..136c88a9cd4 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpCodeFixVerifier.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpCodeFixVerifier.cs
@@ -1,3 +1,5 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Collections.Immutable;
 using System.Linq;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpVerifierHelper.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpVerifierHelper.cs
index ab02eaae045..e55e91ea57f 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpVerifierHelper.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Verifiers/CSharpVerifierHelper.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System;
 using System.Collections.Immutable;
 using Microsoft.CodeAnalysis;
@@ -23,4 +26,4 @@ namespace DllImportGenerator.UnitTests.Verifiers
             return commandLineArguments.CompilationOptions.SpecificDiagnosticOptions;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Arrays.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Arrays.cs
index 0357b593a23..3e11f6c9129 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Arrays.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Arrays.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using SharedTypes;
 using System;
 using System.Collections.Generic;
@@ -210,4 +213,4 @@ namespace NativeExports
             return res;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/BlittableStructs.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/BlittableStructs.cs
index 9bb1d2cc132..f9dbaf9b7e0 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/BlittableStructs.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/BlittableStructs.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 using SharedTypes;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Booleans.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Booleans.cs
index ac729a12882..20df4b754cd 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Booleans.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Booleans.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 namespace NativeExports
 {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CallingConventions.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CallingConventions.cs
index 525dfe991c9..0b97aaae45e 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CallingConventions.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CallingConventions.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.CompilerServices;
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Characters.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Characters.cs
index 768b276b43e..95c666eca4f 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Characters.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Characters.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 namespace NativeExports
 {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CustomMarshalling.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CustomMarshalling.cs
index 539b8d45b8c..2da06a75408 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CustomMarshalling.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/CustomMarshalling.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 using SharedTypes;
 
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/DelegatesAndFunctionPointers.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/DelegatesAndFunctionPointers.cs
index 16fc451c9de..50abe95c3a3 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/DelegatesAndFunctionPointers.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/DelegatesAndFunctionPointers.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace NativeExports
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Demo.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Demo.cs
index 6e82b412b6b..42d55bc5ee9 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Demo.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Demo.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 namespace NativeExports
 {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Error.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Error.cs
index 8963c813871..add53a9f9f4 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Error.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Error.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace NativeExports
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/HResult.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/HResult.cs
index f960887e747..891dbade60b 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/HResult.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/HResult.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace NativeExports
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Handles.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Handles.cs
index 4ab5b0b8445..76664b88208 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Handles.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Handles.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 
@@ -80,4 +83,4 @@ namespace NativeExports
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Numeric.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Numeric.cs
index 2fde4b3ac0a..b6cff4680b9 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Numeric.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Numeric.cs
@@ -1,4 +1,7 @@
-using System.Runtime.InteropServices;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices;
 
 namespace NativeExports
 {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Strings.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Strings.cs
index 44458182ce3..acb72da759c 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Strings.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/NativeExports/Strings.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace NativeExports
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/Blittable.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/Blittable.cs
index cdc00dfd0d3..dec9f74ab49 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/Blittable.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/Blittable.cs
@@ -1,4 +1,7 @@
-using System;
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
 using System.Runtime.InteropServices;
 
 namespace SharedTypes
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/DNNE.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/DNNE.cs
index 85f4a6e5272..0b3dd369433 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/DNNE.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/DNNE.cs
@@ -1,4 +1,7 @@
-namespace DNNE
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace DNNE
 {
     public class C99DeclCodeAttribute : System.Attribute
     {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/NonBlittable.cs b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/NonBlittable.cs
index 35275afa091..5d46f83e845 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/NonBlittable.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/TestAssets/SharedTypes/NonBlittable.cs
@@ -1,3 +1,6 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;