From 7ddbf59fbd1d3758f10b56ead0b5d2970911c4a7 Mon Sep 17 00:00:00 2001
From: Robert Muir <rmuir@apache.org>
Date: Sat, 9 Nov 2013 02:57:16 +0000
Subject: [PATCH] fix test fail

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1540250 13f79535-47bb-0310-9956-ffa450edef68
---
 .../org/apache/lucene/index/BasePostingsFormatTestCase.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lucene/test-framework/src/java/org/apache/lucene/index/BasePostingsFormatTestCase.java b/lucene/test-framework/src/java/org/apache/lucene/index/BasePostingsFormatTestCase.java
index 88c668f4dd9..2ee380e3478 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/index/BasePostingsFormatTestCase.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/index/BasePostingsFormatTestCase.java
@@ -1475,7 +1475,9 @@ public abstract class BasePostingsFormatTestCase extends LuceneTestCase {
                     }
 
                     // Also test seeking the TermsEnum:
-                    for(String term : termFreqs.keySet()) {
+                    // must make copy because this very code sometimes makes puts while iterating?!
+                    Set<String> copy = new HashSet<String>(termFreqs.keySet());
+                    for(String term : copy) {
                       if (termsEnum.seekExact(new BytesRef(term))) {
                         if (random().nextBoolean()) {
                           docs = termsEnum.docs(null, docs, DocsEnum.FLAG_FREQS);