Work on calling CSharp functions from Lua

UpsilonTests/UserDataTests.cs

@@ -2,6 +2,7 @@ using System;
 using Upsilon.BaseTypes.UserData;
 using Upsilon.Evaluator;
 using Xunit;
+// ReSharper disable UnusedMember.Local
 
 namespace UpsilonTests
 {
@@ -24,6 +25,18 @@ namespace UpsilonTests
         {
             public string FieldString = "TestField";
             public string FieldStringSet;
+
+            public bool TestMethodHasRun { get; private set; }
+            public void TestMethod()
+            {
+                TestMethodHasRun = true;
+            }
+
+            public long Add(long a, long b)
+            {
+                return a + b;
+            }
+
         }
         #pragma warning restore 414, 649
 
@@ -60,5 +73,36 @@ end
             Assert.Equal("Test", obj.FieldStringSet);
         }
 
+        [Fact]
+        public void RunVoidMethod()
+        {
+            var obj = new UserDataHelper();
+            const string input = @"
+function test(o)
+    o[""TestMethod""]()
+end
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            script.EvaluateFunction("test", new[] {obj});
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.True(obj.TestMethodHasRun);
+        }
+
+        [Fact]
+        public void ReturnMethodWithParameters()
+        {
+            var obj = new UserDataHelper();
+            const string input = @"
+function test(o)
+    return o[""Add""](100, 20)
+end
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            var result = script.EvaluateFunction<long>("test", new[] {obj});
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(result, 120);
+        }
     }
 }