C++: Instantiate inline expectation test framework to test model generation.

cpp/ql/lib/utils/test/InlineMadTest.qll

@@ -0,0 +1,34 @@
+private import cpp
+private import codeql.mad.test.InlineMadTest
+
+class MadRelevantFunction extends Function {
+  MadRelevantFunction() { not this.isFromUninstantiatedTemplate(_) }
+}
+
+private module InlineMadTestLang implements InlineMadTestLangSig {
+  class Callable = MadRelevantFunction;
+
+  /**
+   * Holds if `c` is the closest `Callable` that suceeds `comment` in the file.
+   */
+  private predicate hasClosestCallable(CppStyleComment comment, Callable c) {
+    c =
+      min(Callable cand, int dist |
+        // This has no good join order, but should hopefully be good enough for tests.
+        cand.getFile() = comment.getFile() and
+        dist = cand.getLocation().getStartLine() - comment.getLocation().getStartLine() and
+        dist > 0
+      |
+        cand order by dist
+      )
+  }
+
+  string getComment(Callable c) {
+    exists(CppStyleComment comment |
+      hasClosestCallable(comment, c) and
+      result = comment.getContents().suffix(2)
+    )
+  }
+}
+
+import InlineMadTestImpl<InlineMadTestLang>