consolidate the tests locations

src/__Tests/shared/OpenSslAutoInit.cs

@@ -0,0 +1,15 @@
+using System.Runtime.CompilerServices;
+
+namespace StellaOps.Testing;
+
+/// <summary>
+/// Automatically ensures OpenSSL 1.1 shim is visible for tests that require legacy OpenSSL.
+/// </summary>
+internal static class OpenSslAutoInit
+{
+    [ModuleInitializer]
+    public static void Init()
+    {
+        OpenSslLegacyShim.EnsureOpenSsl11();
+    }
+}

src/__Tests/shared/OpenSslLegacyShim.cs

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+using System;
+using System.IO;
+using System.Linq;
+
+namespace StellaOps.Testing;
+
+/// <summary>
+/// Ensures OpenSSL 1.1 native libraries are visible on platforms that no longer ship them.
+/// </summary>
+public static class OpenSslLegacyShim
+{
+    private const string LinuxLibraryVariable = "LD_LIBRARY_PATH";
+
+    public static void EnsureOpenSsl11()
+    {
+        if (!OperatingSystem.IsLinux())
+        {
+            return;
+        }
+
+        var nativeDirectory = Path.Combine(AppContext.BaseDirectory, "native", "linux-x64");
+        if (!Directory.Exists(nativeDirectory))
+        {
+            return;
+        }
+
+        var current = Environment.GetEnvironmentVariable(LinuxLibraryVariable);
+        if (string.IsNullOrEmpty(current))
+        {
+            Environment.SetEnvironmentVariable(LinuxLibraryVariable, nativeDirectory);
+            return;
+        }
+
+        const char separator = ':';
+        var segments = current.Split(separator, StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+        if (segments.Contains(nativeDirectory, StringComparer.Ordinal))
+        {
+            return;
+        }
+
+        Environment.SetEnvironmentVariable(LinuxLibraryVariable, string.Concat(nativeDirectory, separator, current));
+    }
+}