add callgraph test for signature predicates

Author: erik-krogh

ql/ql/test/callgraph/ParamModules.qll

@@ -0,0 +1,19 @@
+module PredicateSig {
+  signature predicate fooSig(int i);
+
+  module UsesFoo<fooSig/1 fooImpl> {
+    predicate bar(int i) { fooImpl(i + 1) }
+  }
+
+  predicate myFoo(int i) { i = 42 }
+
+  predicate use(int i) { UsesFoo<myFoo/1>::bar(i) }
+}
+
+module ClassSig {
+  // TODO:
+}
+
+module ModuleSig {
+  // TODO:
+}

ql/ql/test/callgraph/callgraph.expected

@@ -21,6 +21,8 @@ getTarget
 | Overrides.qll:24:39:24:48 | MemberCall | Overrides.qll:22:12:22:44 | ClassPredicate bar |
 | Overrides.qll:28:3:28:9 | MemberCall | Overrides.qll:6:3:6:29 | ClassPredicate bar |
 | Overrides.qll:29:3:29:10 | MemberCall | Overrides.qll:8:3:8:41 | ClassPredicate baz |
+| ParamModules.qll:5:28:5:41 | PredicateCall | ParamModules.qll:2:13:2:36 | ClasslessPredicate fooSig |
+| ParamModules.qll:10:26:10:49 | PredicateCall | ParamModules.qll:5:5:5:43 | ClasslessPredicate bar |
 | packs/other/OtherThing.qll:5:3:5:8 | PredicateCall | packs/lib/LibThing/Foo.qll:1:1:1:30 | ClasslessPredicate foo |
 | packs/other/OtherThing.qll:6:3:6:8 | PredicateCall | packs/src/SrcThing.qll:8:1:8:30 | ClasslessPredicate bar |
 | packs/src/SrcThing.qll:4:3:4:8 | PredicateCall | packs/lib/LibThing/Foo.qll:1:1:1:30 | ClasslessPredicate foo |
@@ -33,3 +35,5 @@ exprPredicate
 | Foo.qll:26:22:26:31 | predicate | Foo.qll:20:3:20:54 | ClasslessPredicate myThing2 |
 | Foo.qll:47:55:47:62 | predicate | Foo.qll:42:20:42:27 | NewTypeBranch MkRoot |
 | Foo.qll:47:65:47:70 | predicate | Foo.qll:44:9:44:56 | ClasslessPredicate edge |
+| ParamModules.qll:4:18:4:25 | predicate | ParamModules.qll:2:13:2:36 | ClasslessPredicate fooSig |
+| ParamModules.qll:10:34:10:40 | predicate | ParamModules.qll:8:3:8:35 | ClasslessPredicate myFoo |