diff --git a/src/ApiBuilderTests/SanityChecks.cs b/src/ApiBuilderTests/SanityChecks.cs
deleted file mode 100644
index 27a96695..00000000
--- a/src/ApiBuilderTests/SanityChecks.cs
+++ /dev/null
@@ -1,125 +0,0 @@
-#pragma warning disable IL2026
-
-[TestFixture]
-public class SanityChecks
-{
-    [Test]
-    public void NoPublicTypes()
-    {
-        var visibleTypes = typeof(SanityChecks).Assembly
-            .GetExportedTypes()
-            .Where(type => type.Namespace?.StartsWith("System") == true);
-#if PolyPublic
-#if !NET7_0_OR_GREATER
-        Assert.That(visibleTypes, Is.Not.Empty);
-#endif
-#else
-        Assert.That(visibleTypes, Is.Empty);
-#endif
-    }
-#if DEBUG
-    [Test]
-    public void CodeChecks()
-    {
-        var dir = Path.Combine(SolutionDirectoryFinder.Find(), "Polyfill");
-        var errors = new List<string>();
-        foreach (var file in Directory.EnumerateFiles(dir, "*.cs", SearchOption.AllDirectories))
-        {
-            var directoryName = Path.GetDirectoryName(file)!;
-            if (directoryName.Contains("bin") || directoryName.Contains("obj"))
-            {
-                continue;
-            }
-
-            var content = File.ReadAllText(file);
-            var requiredText = new[]
-            {
-                "// <auto-generated />",
-                "#pragma warning disable"
-            };
-            foreach (var required in requiredText)
-            {
-                if (!content.Contains(required))
-                {
-                    errors.Add($"{file} must contain '{required}'");
-                }
-            }
-        }
-
-        if (errors.Count > 0)
-        {
-            throw new(string.Join("\n", errors));
-        }
-    }
-#endif
-    // [Test]
-    // public void ReflectionChecks()
-    // {
-    //     var errors = new List<string>();
-    //     foreach (var type in typeof(SanityChecks).Assembly.GetTypes())
-    //     {
-    //         if (type.Namespace != null && !type.Namespace.StartsWith("System"))
-    //         {
-    //             continue;
-    //         }
-    //
-    //         if (type.IsNested)
-    //         {
-    //             continue;
-    //         }
-    //
-    //         if (HasAttribute<TestFixtureAttribute>(type))
-    //         {
-    //             continue;
-    //         }
-    //
-    //         var name = type.Name;
-    //         if (name.EndsWith("Usage") ||
-    //             name.Contains("<") ||
-    //             name.Contains("Sample") ||
-    //             name == "SolutionDirectoryFinder" ||
-    //             name == "AutoGeneratedProgram" ||
-    //             name == "IsReadOnlyAttribute" ||
-    //             name == "IsByRefLikeAttribute" ||
-    //             name == "NullableAttribute" ||
-    //             name == "NullableContextAttribute" ||
-    //             name == "ScopedRefAttribute" ||
-    //             name == "RefSafetyRulesAttribute" ||
-    //             name == "ParamCollectionAttribute" ||
-    //             name == "FileUtil")
-    //         {
-    //             continue;
-    //         }
-    //
-    //         if (type is {IsInterface: false, IsEnum: false})
-    //         {
-    //             if (!HasAttribute<ExcludeFromCodeCoverageAttribute>(type))
-    //             {
-    //                 errors.Add($"{name} must have ExcludeFromCodeCoverageAttribute");
-    //             }
-    //
-    //             if (!HasAttribute<DebuggerNonUserCodeAttribute>(type))
-    //             {
-    //                 errors.Add($"{name} must have DebuggerNonUserCodeAttribute");
-    //             }
-    //         }
-    //     }
-    //
-    //     if (errors.Count > 0)
-    //     {
-    //         throw new(string.Join("\n", errors));
-    //     }
-    // }
-
-    static bool HasAttribute<T>(Type type)
-    {
-        try
-        {
-            return type.GetCustomAttribute(typeof(T)) != null;
-        }
-        catch (Exception e)
-        {
-            throw new($"Failed to get {typeof(T).Name} from {type.Name}", e);
-        }
-    }
-}
\ No newline at end of file
diff --git a/src/Tests/SanityChecks.cs b/src/Tests/SanityChecks.cs
new file mode 100644
index 00000000..874ce239
--- /dev/null
+++ b/src/Tests/SanityChecks.cs
@@ -0,0 +1,125 @@
+#pragma warning disable IL2026
+
+[TestFixture]
+public class SanityChecks
+{
+    [Test]
+    public void NoPublicTypes()
+    {
+        var visibleTypes = typeof(SanityChecks).Assembly
+            .GetExportedTypes()
+            .Where(type => type.Namespace?.StartsWith("System") == true);
+#if PolyPublic
+#if !NET7_0_OR_GREATER
+        Assert.That(visibleTypes, Is.Not.Empty);
+#endif
+#else
+        Assert.That(visibleTypes, Is.Empty);
+#endif
+    }
+#if DEBUG
+    [Test]
+    public void CodeChecks()
+    {
+        var dir = Path.Combine(SolutionDirectoryFinder.Find(), "Polyfill");
+        var errors = new List<string>();
+        foreach (var file in Directory.EnumerateFiles(dir, "*.cs", SearchOption.AllDirectories))
+        {
+            var directoryName = Path.GetDirectoryName(file)!;
+            if (directoryName.Contains("bin") || directoryName.Contains("obj"))
+            {
+                continue;
+            }
+
+            var content = File.ReadAllText(file);
+            var requiredText = new[]
+            {
+                "// <auto-generated />",
+                "#pragma warning disable"
+            };
+            foreach (var required in requiredText)
+            {
+                if (!content.Contains(required))
+                {
+                    errors.Add($"{file} must contain '{required}'");
+                }
+            }
+        }
+
+        if (errors.Count > 0)
+        {
+            throw new(string.Join("\n", errors));
+        }
+    }
+#endif
+    [Test]
+    public void ReflectionChecks()
+    {
+        var errors = new List<string>();
+        foreach (var type in typeof(SanityChecks).Assembly.GetTypes())
+        {
+            if (type.Namespace != null && !type.Namespace.StartsWith("System"))
+            {
+                continue;
+            }
+
+            if (type.IsNested)
+            {
+                continue;
+            }
+
+            if (HasAttribute<TestFixtureAttribute>(type))
+            {
+                continue;
+            }
+
+            var name = type.Name;
+            if (name.EndsWith("Usage") ||
+                name.Contains("<") ||
+                name.Contains("Sample") ||
+                name == "SolutionDirectoryFinder" ||
+                name == "AutoGeneratedProgram" ||
+                name == "IsReadOnlyAttribute" ||
+                name == "IsByRefLikeAttribute" ||
+                name == "NullableAttribute" ||
+                name == "NullableContextAttribute" ||
+                name == "ScopedRefAttribute" ||
+                name == "RefSafetyRulesAttribute" ||
+                name == "ParamCollectionAttribute" ||
+                name == "FileUtil")
+            {
+                continue;
+            }
+
+            if (type is {IsInterface: false, IsEnum: false})
+            {
+                if (!HasAttribute<ExcludeFromCodeCoverageAttribute>(type))
+                {
+                    errors.Add($"{name} must have ExcludeFromCodeCoverageAttribute");
+                }
+
+                if (!HasAttribute<DebuggerNonUserCodeAttribute>(type))
+                {
+                    errors.Add($"{name} must have DebuggerNonUserCodeAttribute");
+                }
+            }
+        }
+
+        if (errors.Count > 0)
+        {
+            throw new(string.Join("\n", errors));
+        }
+    }
+
+    static bool HasAttribute<T>(Type type)
+    {
+        try
+        {
+            return type.GetCustomAttribute(typeof(T)) != null;
+        }
+        catch (Exception e)
+        {
+            throw new($"Failed to get {typeof(T).Name} from {type.Name}", e);
+        }
+    }
+}
\ No newline at end of file