added a test for MyMacroTestEnum + split LINQ to different lines

tests/CSharp/CSharp.Tests.cs

@@ -722,4 +722,12 @@ public unsafe class CSharpTests : GeneratorTestFixture
         var i = CSharp.CSharp.UseDuplicateDeclaredStruct(duplicateDeclaredIncompleteStruct);
         Assert.AreEqual(10, i);
     }
+
+    [Test]
+    public void TestMyMacroTestEnum()
+    {
+        var a = (MyMacroTestEnum)'1';
+        var b = (MyMacroTestEnum)'2';
+        Assert.IsTrue(a == MyMacroTestEnum.MY_MACRO_TEST_1 && b == MyMacroTestEnum.MY_MACRO_TEST_2);
+    }
 }

tests/CSharp/CSharp.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
 using CppSharp.AST;
@@ -39,7 +40,17 @@ namespace CppSharp.Tests
             ctx.IgnoreClassWithName("IgnoredTypeInheritingNonIgnoredWithNoEmptyCtor");
 
             var macroRegex = new Regex(@"(MY_MACRO_TEST_.*)");
-            var enumTest = ctx.GenerateEnumFromMacros("MyMacroTestEnum", (from unit in ctx.TranslationUnits where unit.FilePath == "<invalid>" || unit.FileName == "CSharp.h" from macro in unit.PreprocessedEntities.OfType<MacroDefinition>() let match = macroRegex.Match(macro.Name) where match.Success select macro.Name).ToArray());
+            List<string> list = new List<string>();
+            foreach (TranslationUnit unit in ctx.TranslationUnits)
+            {
+              if (unit.FilePath == "<invalid>" || unit.FileName == "CSharp.h")
+                foreach (var macro in unit.PreprocessedEntities.OfType<MacroDefinition>())
+                {
+                  Match match = macroRegex.Match(macro.Name);
+                  if (match.Success) list.Add(macro.Name);
+                }
+            }
+            var enumTest = ctx.GenerateEnumFromMacros("MyMacroTestEnum", list.ToArray());
               enumTest.Namespace = new Namespace() {Name = "MacroTest"};
         }