Add testing export macros

Code/max/Testing/TestingExport.hpp

@@ -0,0 +1,27 @@
+// Copyright 2026, The max Contributors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MAX_TESTING_EXPORT_HPP
+#define MAX_TESTING_EXPORT_HPP
+
+// There are functions which are only used within a given translation unit.
+// They should not be exported to the linker.
+
+// However, you will want to test those functions. And since the test code
+// likely lives in a different file, you *will* want the functions to be
+// exported to the linker.
+
+// If a project has the definition MAX_TEST, these macros will export the
+// functions marked with them.
+// A normal project won't define MAX_TEST and so the functions remain hidden.
+
+#ifdef MAX_TEST
+	#define MAX_TESTING_EXPORT_DECLARATION( Declaration ) Declaration
+	#define MAX_TESTING_EXPORT_DEFINITION( Definition ) Definition
+#else
+	#define MAX_TESTING_EXPORT_DECLARATION( Declaration )
+	#define MAX_TESTING_EXPORT_DEFINITION( Definition ) static Definition
+#endif
+
+#endif // #ifndef MAX_TESTING_EXPORT_HPP

Projects/VisualStudio/max/max.vcxproj

@@ -289,6 +289,7 @@
     <ClInclude Include="..\..\..\Code\max\Logging\DoNothingLogger.hpp" />
     <ClInclude Include="..\..\..\Code\max\Testing\CoutResultPolicy.hpp" />
     <ClInclude Include="..\..\..\Code\max\Testing\Test.hpp" />
+    <ClInclude Include="..\..\..\Code\max\Testing\TestingExport.hpp" />
     <ClInclude Include="..\..\..\Code\max\Testing\TestSuite.hpp" />
   </ItemGroup>
   <ItemGroup>

Projects/VisualStudio/max/max.vcxproj.filters

@@ -492,6 +492,9 @@
     <ClInclude Include="..\..\..\Code\max\Algorithms\DeferTest.hpp">
       <Filter>Code\max\Algorithms</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\Code\max\Testing\TestingExport.hpp">
+      <Filter>Code\max\Testing</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\..\..\Code\max\Algorithms\IsBetweenTest.cpp">