diff --git a/Source/Engine/Tests/TestCircularBuffer.cs b/Source/Engine/Tests/TestCircularBuffer.cs
index b7ed7d626..c30164a69 100644
--- a/Source/Engine/Tests/TestCircularBuffer.cs
+++ b/Source/Engine/Tests/TestCircularBuffer.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using System.Collections;
 using FlaxEngine.Collections;
@@ -525,3 +526,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestColor.cs b/Source/Engine/Tests/TestColor.cs
index e952eb596..89d207bf2 100644
--- a/Source/Engine/Tests/TestColor.cs
+++ b/Source/Engine/Tests/TestColor.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -38,3 +39,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestContainerControl.cs b/Source/Engine/Tests/TestContainerControl.cs
index bfb479359..10f337725 100644
--- a/Source/Engine/Tests/TestContainerControl.cs
+++ b/Source/Engine/Tests/TestContainerControl.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using FlaxEngine.GUI;
 using NUnit.Framework;
 using Assert = FlaxEngine.Assertions.Assert;
@@ -54,3 +55,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestControl.cs b/Source/Engine/Tests/TestControl.cs
index b76787b0a..30b665f34 100644
--- a/Source/Engine/Tests/TestControl.cs
+++ b/Source/Engine/Tests/TestControl.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using FlaxEngine.GUI;
 using NUnit.Framework;
 using Assert = FlaxEngine.Assertions.Assert;
@@ -110,3 +111,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestEditorUtils.cs b/Source/Engine/Tests/TestEditorUtils.cs
index 8793a4f1f..bd8d5837b 100644
--- a/Source/Engine/Tests/TestEditorUtils.cs
+++ b/Source/Engine/Tests/TestEditorUtils.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using System.Globalization;
 using NUnit.Framework;
@@ -62,3 +63,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestFloatR10G10B10A2.cs b/Source/Engine/Tests/TestFloatR10G10B10A2.cs
index f44848e0f..270482b90 100644
--- a/Source/Engine/Tests/TestFloatR10G10B10A2.cs
+++ b/Source/Engine/Tests/TestFloatR10G10B10A2.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -20,3 +21,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestFloatR11G11B10.cs b/Source/Engine/Tests/TestFloatR11G11B10.cs
index f7761d134..93e9c1507 100644
--- a/Source/Engine/Tests/TestFloatR11G11B10.cs
+++ b/Source/Engine/Tests/TestFloatR11G11B10.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -20,3 +21,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestHistoryStack.cs b/Source/Engine/Tests/TestHistoryStack.cs
index a285f8b8c..99be9b21c 100644
--- a/Source/Engine/Tests/TestHistoryStack.cs
+++ b/Source/Engine/Tests/TestHistoryStack.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using FlaxEditor.History;
 using NUnit.Framework;
@@ -136,3 +137,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestHtmlParser.cs b/Source/Engine/Tests/TestHtmlParser.cs
index 147d07a42..bf77d0125 100644
--- a/Source/Engine/Tests/TestHtmlParser.cs
+++ b/Source/Engine/Tests/TestHtmlParser.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System.Collections.Generic;
 using FlaxEngine.Utilities;
 using NUnit.Framework;
@@ -116,3 +117,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestModulusOperator.cs b/Source/Engine/Tests/TestModulusOperator.cs
index de67edd30..6ef34d6d4 100644
--- a/Source/Engine/Tests/TestModulusOperator.cs
+++ b/Source/Engine/Tests/TestModulusOperator.cs
@@ -1,3 +1,6 @@
+// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
+
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -54,3 +57,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestPropertyNameUI.cs b/Source/Engine/Tests/TestPropertyNameUI.cs
index e51905ff2..d9aff3ea1 100644
--- a/Source/Engine/Tests/TestPropertyNameUI.cs
+++ b/Source/Engine/Tests/TestPropertyNameUI.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using FlaxEditor.Utilities;
 using NUnit.Framework;
 
@@ -28,3 +29,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestQuaternion.cs b/Source/Engine/Tests/TestQuaternion.cs
index 41e784afe..a5a199ab3 100644
--- a/Source/Engine/Tests/TestQuaternion.cs
+++ b/Source/Engine/Tests/TestQuaternion.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -36,3 +37,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestQueryFilterHelper.cs b/Source/Engine/Tests/TestQueryFilterHelper.cs
index fe5ac15e2..03459ef77 100644
--- a/Source/Engine/Tests/TestQueryFilterHelper.cs
+++ b/Source/Engine/Tests/TestQueryFilterHelper.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using FlaxEditor.Utilities;
 using NUnit.Framework;
 
@@ -80,3 +81,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestSceneGraph.cs b/Source/Engine/Tests/TestSceneGraph.cs
index 0484901ce..447e66955 100644
--- a/Source/Engine/Tests/TestSceneGraph.cs
+++ b/Source/Engine/Tests/TestSceneGraph.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using System.Collections.Generic;
 using FlaxEditor.SceneGraph;
@@ -130,3 +131,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestScripting.cs b/Source/Engine/Tests/TestScripting.cs
index 48dae37e3..529ea4f14 100644
--- a/Source/Engine/Tests/TestScripting.cs
+++ b/Source/Engine/Tests/TestScripting.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using System.Reflection;
 using System.Runtime.InteropServices;
@@ -171,3 +172,4 @@ namespace FlaxEngine
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestSerialization.cs b/Source/Engine/Tests/TestSerialization.cs
index 3c57c6888..6e6c33e84 100644
--- a/Source/Engine/Tests/TestSerialization.cs
+++ b/Source/Engine/Tests/TestSerialization.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using FlaxEngine.Json;
 using NUnit.Framework;
@@ -150,3 +151,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestStringUtils.cs b/Source/Engine/Tests/TestStringUtils.cs
index c741210dc..92c2f62d0 100644
--- a/Source/Engine/Tests/TestStringUtils.cs
+++ b/Source/Engine/Tests/TestStringUtils.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using NUnit.Framework;
 
 namespace FlaxEngine.Tests
@@ -24,3 +25,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestSurface.cs b/Source/Engine/Tests/TestSurface.cs
index ed4e269c8..1412aeab3 100644
--- a/Source/Engine/Tests/TestSurface.cs
+++ b/Source/Engine/Tests/TestSurface.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System.Linq;
 using FlaxEditor.Surface;
 using NUnit.Framework;
@@ -56,3 +57,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestTransform.cs b/Source/Engine/Tests/TestTransform.cs
index b4d20023c..59238615d 100644
--- a/Source/Engine/Tests/TestTransform.cs
+++ b/Source/Engine/Tests/TestTransform.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using FlaxEngine.Utilities;
 using NUnit.Framework;
@@ -171,3 +172,4 @@ namespace FlaxEngine.Tests
         }
     }
 }
+#endif
diff --git a/Source/Engine/Tests/TestUndo.cs b/Source/Engine/Tests/TestUndo.cs
index 87cec99f0..7dc4d858d 100644
--- a/Source/Engine/Tests/TestUndo.cs
+++ b/Source/Engine/Tests/TestUndo.cs
@@ -1,5 +1,6 @@
 // Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
 
+#if FLAX_TESTS
 using System;
 using NUnit.Framework;
 using Assert = FlaxEngine.Assertions.Assert;
@@ -404,3 +405,4 @@ namespace FlaxEditor.Tests
         }
     }
 }
+#endif