Tony-X commented on code in PR #12909:
URL: https://github.com/apache/lucene/pull/12909#discussion_r1423089503


##########
lucene/core/src/test/org/apache/lucene/util/automaton/TestNFARunAutomaton.java:
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@@ -73,6 +73,37 @@ public void testWithRandomRegex() {
     }
   }
 
+  public void testRandomAccessTransition() {
+    Automaton nfa = new RegExp(AutomatonTestUtil.randomRegexp(random()), 
RegExp.NONE).toAutomaton();
+    while (nfa.isDeterministic()) {
+      nfa = new RegExp(AutomatonTestUtil.randomRegexp(random()), 
RegExp.NONE).toAutomaton();
+    }
+    NFARunAutomaton runAutomaton1, runAutomaton2;
+    runAutomaton1 = new NFARunAutomaton(nfa);
+    runAutomaton2 = new NFARunAutomaton(nfa);
+    assertRandomAccessTransition(runAutomaton1, runAutomaton2, 0, new 
HashSet<>());
+  }
+
+  private void assertRandomAccessTransition(
+      NFARunAutomaton automaton1, NFARunAutomaton automaton2, int state, 
Set<Integer> visited) {
+    if (visited.contains(state)) {
+      return;
+    }
+    visited.add(state);
+
+    Transition t1 = new Transition();
+    Transition t2 = new Transition();
+    automaton1.initTransition(state, t1);
+    automaton2.initTransition(state, t2);

Review Comment:
   maybe add a random flag here. For the RA API you don't strictly need to 
init, as long as you know the state and the index of the transition. 



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