C#: Add language specific part of the models as data inline expectation.

Author: michaelnebel

csharp/ql/test/TestUtilities/InlineMadTest.qll

@@ -0,0 +1,18 @@
+private import csharp as Cs
+private import codeql.mad.test.InlineMadTest
+
+private module InlineMadTestLang implements InlineMadTestLangSig {
+  class Callable = Cs::Callable;
+
+  string getComment(Callable c) {
+    exists(Cs::CommentBlock block, Cs::Element after | after = block.getAfter() |
+      (
+        after = c or
+        after = c.(Cs::Accessor).getDeclaration()
+      ) and
+      result = block.getALine()
+    )
+  }
+}
+
+import InlineMadTestImpl<InlineMadTestLang>