glawson0 commented on a change in pull request #146:
URL: https://github.com/apache/lucene/pull/146#discussion_r636782125



##########
File path: 
lucene/analysis/common/src/test/org/apache/lucene/analysis/core/TestFlattenGraphFilter.java
##########
@@ -314,5 +314,116 @@ public void testTwoLongParallelPaths() throws Exception {
         11);
   }
 
+  // The end node the long path is supposed to flatten over doesn't exist
+  @AwaitsFix(bugUrl = "https://issues.apache.org/jira/browse/LUCENE-9963";)
+  public void testAltPathFirstStepHole() throws Exception {
+    TokenStream in =
+        new CannedTokenStream(
+            0,
+            3,
+            new Token[] {token("abc", 1, 3, 0, 3), token("b", 1, 1, 1, 2), 
token("c", 1, 1, 2, 3)});
+
+    TokenStream out = new FlattenGraphFilter(in);
+
+    assertTokenStreamContents(

Review comment:
       I've added a test that builds a graph then deletes some tokens. It 
already found another failure case in my fix.




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