CFG: sort expected output by file path and line

ql/src/codeql_ruby/controlflow/internal/Cfg.ql

@@ -4,7 +4,20 @@
 
 import codeql_ruby.CFG
 
-query predicate nodes(CfgNode n) { any() }
+query predicate nodes(CfgNode n, string attr, string val) {
+  attr = "semmle.order" and
+  val =
+    any(int i |
+      n =
+        rank[i](CfgNode p |
+          |
+          p
+          order by
+            p.getLocation().getFile().getBaseName(), p.getLocation().getFile().getAbsolutePath(),
+            p.getLocation().getStartLine()
+        )
+    ).toString()
+}
 
 query predicate edges(CfgNode pred, CfgNode succ, string attr, string val) {
   exists(SuccessorType t | succ = pred.getASuccessor(t) |