1 files changed, 123 insertions, 0 deletions
diff --git a/tests/dotnet/lsprotocol_tests/LSPTests.cs b/tests/dotnet/lsprotocol_tests/LSPTests.cs
new file mode 100644
index 0000000..80a19ae
--- /dev/null
+++ b/tests/dotnet/lsprotocol_tests/LSPTests.cs
@@ -0,0 +1,123 @@
+
+namespace lsprotocol_tests;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+
+public class LSPTests
+{
+    public static IEnumerable<object[]> JsonTestData()
+    {
+        string folderPath;
+        // Read test data path from environment variable
+        if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("LSP_TEST_DATA_PATH")))
+        {
+            folderPath = Environment.GetEnvironmentVariable("LSP_TEST_DATA_PATH");
+        }
+        else
+        {
+            throw new Exception("LSP_TEST_DATA_PATH environment variable not set");
+        }
+
+        string[] jsonFiles = Directory.GetFiles(folderPath, "*.json");
+        foreach (string filePath in jsonFiles)
+        {
+            yield return new object[] { filePath };
+        }
+    }
+
+    [Theory]
+    [MemberData(nameof(JsonTestData))]
+    public void ValidateLSPTypes(string filePath)
+    {
+        string original = File.ReadAllText(filePath);
+
+        // Get the class name from the file name
+        // format: <class-name>-<valid>-<test-id>.json
+        // classname => Class name of the type to deserialize to
+        // valid => true if the file is valid, false if it is invalid
+        // test-id => unique id for the test
+        string fileName = Path.GetFileNameWithoutExtension(filePath);
+        string[] nameParts = fileName.Split('-');
+        string className = nameParts[0];
+        bool valid = nameParts[1] == "True";
+
+        Type type = Type.GetType($"Microsoft.LanguageServer.Protocol.{className}, lsprotocol") ?? throw new Exception($"Type {className} not found");
+        RunTest(valid, original, type);
+    }
+
+    private static void RunTest(bool valid, string data, Type type)
+    {
+        if (valid)
+        {
+            try
+            {
+                var settings = new JsonSerializerSettings
+                {
+                    MissingMemberHandling = MissingMemberHandling.Error
+                };
+                object? deserializedObject = JsonConvert.DeserializeObject(data, type, settings);
+                string newJson = JsonConvert.SerializeObject(deserializedObject, settings);
+
+                JToken token1 = JToken.Parse(data);
+                JToken token2 = JToken.Parse(newJson);
+                RemoveNullProperties(token1);
+                RemoveNullProperties(token2);
+                Assert.True(JToken.DeepEquals(token1, token2), $"JSON before and after serialization don't match:\r\nBEFORE:{data}\r\nAFTER:{newJson}");
+            }
+            catch (Exception e)
+            {
+                // Explicitly fail the test
+                Assert.True(false, $"Should not have thrown an exception for [{type.Name}]: {data} \r\n{e}");
+            }
+        }
+        else
+        {
+            try
+            {
+                JsonConvert.DeserializeObject(data, type);
+                // Explicitly fail the test
+                Assert.True(false, $"Should have thrown an exception for [{type.Name}]: {data}");
+            }
+            catch
+            {
+                // Worked as expected.
+            }
+        }
+    }
+
+    private static void RemoveNullProperties(JToken token)
+    {
+        if (token.Type == JTokenType.Object)
+        {
+            var obj = (JObject)token;
+
+            var propertiesToRemove = obj.Properties()
+                .Where(p => p.Value.Type == JTokenType.Null)
+                .ToList();
+
+            foreach (var property in propertiesToRemove)
+            {
+                property.Remove();
+            }
+
+            foreach (var property in obj.Properties())
+            {
+                RemoveNullProperties(property.Value);
+            }
+        }
+        else if (token.Type == JTokenType.Array)
+        {
+            var array = (JArray)token;
+
+            for (int i = array.Count - 1; i >= 0; i--)
+            {
+                RemoveNullProperties(array[i]);
+                if (array[i].Type == JTokenType.Null)
+                {
+                    array.RemoveAt(i);
+                }
+            }
+        }
+    }
+}
+\ No newline at end of file