Alan Woodward created LUCENE-8568:
-------------------------------------

             Summary: TestMockDirectoryWrapper failure
                 Key: LUCENE-8568
                 URL: https://issues.apache.org/jira/browse/LUCENE-8568
             Project: Lucene - Core
          Issue Type: Task
    Affects Versions: master (8.0)
            Reporter: Alan Woodward


The elasticsearch CI found a reproducing failure in test-framework:
{code}
[junit4] Suite: org.apache.lucene.store.TestMockDirectoryWrapper
   [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=TestMockDirectoryWrapper -Dtests.method=testSeekPastEOF 
-Dtests.seed=8CA554881B469221 -Dtests.slow=true -Dtests.badapples=true 
-Dtests.locale=ar -Dtests.timezone=Africa/Niamey -Dtests.asserts=true 
-Dtests.file.encoding=US-ASCII
   [junit4] FAILURE 0.05s | TestMockDirectoryWrapper.testSeekPastEOF <<<
   [junit4]    > Throwable #1: junit.framework.AssertionFailedError: Unexpected 
exception type, expected EOFException but got java.lang.NullPointerException
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([8CA554881B469221:6CE39F711BC3ECB0]:0)
   [junit4]    >        at 
org.apache.lucene.util.LuceneTestCase.expectThrows(LuceneTestCase.java:2679)
   [junit4]    >        at 
org.apache.lucene.util.LuceneTestCase.expectThrows(LuceneTestCase.java:2668)
   [junit4]    >        at 
org.apache.lucene.store.BaseDirectoryTestCase.testSeekPastEOF(BaseDirectoryTestCase.java:524)
   [junit4]    >        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   [junit4]    >        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   [junit4]    >        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   [junit4]    >        at 
java.base/java.lang.reflect.Method.invoke(Method.java:566)
   [junit4]    >        at java.base/java.lang.Thread.run(Thread.java:834)
   [junit4]    >        Suppressed: java.lang.RuntimeException: 
MockDirectoryWrapper: cannot close: there are still 1 open files: {out=1}
   [junit4]    >                at 
org.apache.lucene.store.MockDirectoryWrapper.close(MockDirectoryWrapper.java:838)
   [junit4]    >                at 
org.apache.lucene.store.BaseDirectoryTestCase.testSeekPastEOF(BaseDirectoryTestCase.java:527)
   [junit4]    >                ... 35 more
   [junit4]    >        Caused by: java.lang.RuntimeException: unclosed 
IndexInput: out
   [junit4]    >                at 
org.apache.lucene.store.MockDirectoryWrapper.addFileHandle(MockDirectoryWrapper.java:730)
   [junit4]    >                at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:773)
   [junit4]    >                at 
org.apache.lucene.store.BaseDirectoryTestCase.testSeekPastEOF(BaseDirectoryTestCase.java:515)
   [junit4]    >                ... 35 more
   [junit4]    > Caused by: java.lang.NullPointerException
   [junit4]    >        at 
org.apache.lucene.store.RAMInputStream.readByte(RAMInputStream.java:75)
   [junit4]    >        at 
org.apache.lucene.store.MockIndexInputWrapper.readByte(MockIndexInputWrapper.java:140)
   [junit4]    >        at 
org.apache.lucene.util.LuceneTestCase.expectThrows(LuceneTestCase.java:2674)
   [junit4]    >        ... 37 more
   [junit4]   2> NOTE: leaving temporary files on disk at: 
/Users/romseygeek/projects/lucene-solr-master/lucene/build/test-framework/test/J0/temp/lucene.store.TestMockDirectoryWrapper_8CA554881B469221-001
   [junit4]   2> NOTE: test params are: codec=Asserting(Lucene80): {}, 
docValues:{}, maxPointsInLeafNode=1937, maxMBSortInHeap=7.245645580981918, 
sim=Asserting(org.apache.lucene.search.similarities.AssertingSimilarity@64aabfe0),
 locale=ar, timezone=Africa/Niamey
   [junit4]   2> NOTE: Mac OS X 10.14.1 x86_64/Oracle Corporation 11 
(64-bit)/cpus=8,threads=1,free=240218112,total=268435456
   [junit4]   2> NOTE: All tests run in this JVM: [TestMockDirectoryWrapper]
   [junit4] Completed [1/1 (1!)] in 0.42s, 1 test, 1 failure <<< FAILURES!
   [junit4]
   [junit4]
   [junit4] Tests with failures [seed: 8CA554881B469221]:
   [junit4]   - org.apache.lucene.store.TestMockDirectoryWrapper.testSeekPastEOF
{code}



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