Refactor to Roslyn for code formatting, remove JetBrains cleanup

DotSchema.Tests/CodePostProcessorTests.cs

@@ -173,4 +173,173 @@ public partial class MyType
         Assert.Contains("public sealed class MyType", result);
         Assert.DoesNotContain("public partial class MyType", result);
     }
+
+    [Fact]
+    public void Process_RemovesAdditionalPropertiesBoilerplate()
+    {
+        var code = """
+            namespace Test;
+
+            public partial class MyType
+            {
+                public string Name { get; set; }
+
+                private System.Collections.Generic.IDictionary<string, object>? _additionalProperties;
+
+                [System.Text.Json.Serialization.JsonExtensionData]
+                public System.Collections.Generic.IDictionary<string, object> AdditionalProperties
+                {
+                    get { return _additionalProperties ?? (_additionalProperties = new System.Collections.Generic.Dictionary<string, object>()); }
+                    set { _additionalProperties = value; }
+                }
+            }
+            """;
+
+        var result = CodePostProcessor.Process(
+            code,
+            GenerationMode.All,
+            "",
+            EmptySet,
+            EmptySet,
+            EmptySet,
+            "Config");
+
+        Assert.DoesNotContain("_additionalProperties", result);
+        Assert.DoesNotContain("AdditionalProperties", result);
+        Assert.DoesNotContain("JsonExtensionData", result);
+        Assert.Contains("Name", result);
+    }
+
+    [Fact]
+    public void Process_PreservesBaseClassesAsNonSealed()
+    {
+        var code = """
+            namespace Test;
+
+            public partial class BaseType
+            {
+                public string Name { get; set; }
+            }
+
+            public partial class DerivedType : BaseType
+            {
+                public int Value { get; set; }
+            }
+            """;
+
+        var result = CodePostProcessor.Process(
+            code,
+            GenerationMode.All,
+            "",
+            EmptySet,
+            EmptySet,
+            EmptySet,
+            "Config");
+
+        // BaseType should NOT be sealed (it's inherited from)
+        Assert.DoesNotContain("public sealed class BaseType", result);
+
+        // DerivedType should be sealed
+        Assert.Contains("public sealed class DerivedType", result);
+    }
+
+    [Fact]
+    public void Process_SharedMode_RemovesRootType()
+    {
+        var code = """
+            namespace Test;
+
+            public partial class SharedType
+            {
+                public string Name { get; set; }
+            }
+
+            public partial class Config
+            {
+                public int Value { get; set; }
+            }
+            """;
+
+        var result = CodePostProcessor.Process(
+            code,
+            GenerationMode.Shared,
+            "",
+            EmptySet,
+            EmptySet,
+            EmptySet,
+            "Config");
+
+        Assert.Contains("SharedType", result);
+        Assert.DoesNotContain("public sealed class Config", result);
+    }
+
+    [Fact]
+    public void Process_DoesNotSealAbstractClasses()
+    {
+        var code = """
+            namespace Test;
+
+            public abstract partial class AbstractBase
+            {
+                public abstract string Name { get; set; }
+            }
+
+            public partial class ConcreteType : AbstractBase
+            {
+                public override string Name { get; set; }
+            }
+            """;
+
+        var result = CodePostProcessor.Process(
+            code,
+            GenerationMode.All,
+            "",
+            EmptySet,
+            EmptySet,
+            EmptySet,
+            "Config");
+
+        // AbstractBase should remain abstract (not sealed)
+        Assert.Contains("public abstract class AbstractBase", result);
+        Assert.DoesNotContain("sealed abstract", result);
+
+        // ConcreteType should NOT be sealed either (it's a base class for AbstractBase inheritance)
+        // Actually, ConcreteType inherits from AbstractBase, so AbstractBase is the base class
+        // ConcreteType should be sealed since it's not inherited from
+        Assert.Contains("public sealed class ConcreteType", result);
+    }
+
+    [Fact]
+    public void Process_DoesNotSealStaticClasses()
+    {
+        var code = """
+            namespace Test;
+
+            public static partial class StaticHelper
+            {
+                public static string GetValue() => "test";
+            }
+
+            public partial class NormalType
+            {
+                public string Name { get; set; }
+            }
+            """;
+
+        var result = CodePostProcessor.Process(
+            code,
+            GenerationMode.All,
+            "",
+            EmptySet,
+            EmptySet,
+            EmptySet,
+            "Config");
+
+        // StaticHelper should remain static (not sealed)
+        Assert.Contains("public static class StaticHelper", result);
+        Assert.DoesNotContain("sealed static", result);
+
+        // NormalType should be sealed
+        Assert.Contains("public sealed class NormalType", result);
+    }
 }