diff --git a/tests/Avalonia.ReactiveUI.UnitTests/Attributes.cs b/tests/Avalonia.ReactiveUI.UnitTests/Attributes.cs
index 79e58f63e9..a79647d355 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/Attributes.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/Attributes.cs
@@ -1,3 +1,6 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
 using Xunit;
 
 // Required to avoid InvalidOperationException sometimes thrown
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs b/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
index f4dffdc0c3..2c81e8fea3 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
@@ -1,3 +1,6 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
 using System;
 using System.Reactive.Concurrency;
 using System.Reactive.Disposables;
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs b/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
index c6017d3f5f..e873c60e36 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
@@ -1,3 +1,6 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
 using System;
 using System.Reactive.Concurrency;
 using System.Reactive.Disposables;
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/ViewModelViewHostTest.cs b/tests/Avalonia.ReactiveUI.UnitTests/ViewModelViewHostTest.cs
index 5d5d15358e..a21bf34ef5 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/ViewModelViewHostTest.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/ViewModelViewHostTest.cs
@@ -1,3 +1,6 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
 using Avalonia.Controls;
 using Avalonia.UnitTests;
 using ReactiveUI;