JS: Add test case showing problem with chains going through internal classes

Author: asgerf

javascript/ql/test/library-tests/ModelGeneration/ModelGeneration.expected

@@ -48,6 +48,9 @@ typeModel
 | (subclass).D | subclass | Member[D] |
 | (subclass).D.prototype | (subclass).D | Instance |
 | (subclass).D.prototype.d | (subclass).D.prototype | Member[d] |
+| (subclass).ExposedMidSubClass | subclass | Member[ExposedMidSubClass] |
+| (subclass).ExposedMidSubClass.prototype | (subclass).ExposedMidSubClass | Instance |
+| (subclass).ExposedMidSubClass.prototype.m | (subclass).ExposedMidSubClass.prototype | Member[m] |
 | upstream-lib | (reexport).func | ReturnValue |
 | upstream-lib | reexport | Member[lib] |
 | upstream-lib.Type | (subclass).D.prototype |  |

javascript/ql/test/library-tests/ModelGeneration/subclass/subclass.js

@@ -15,3 +15,11 @@ import * as upstream from "upstream-lib";
 export class D extends upstream.Type {
     d() {}
 }
+
+// Test case where subclass chain goes through an internal class
+// TODO: we miss the subclass chain between ExposedMidSubClass and A
+class InternalMidClass extends A {}
+
+export class ExposedMidSubClass extends InternalMidClass {
+    m() {}
+}