adoroszlai opened a new pull request, #5578:
URL: https://github.com/apache/hadoop/pull/5578

   ## What changes were proposed in this pull request?
   
   Fix assertion message in `AbstractContractRootDirectoryTest` by calling 
`join(Object[], String)` instead of `join(T...)` (where `T` was calculated to 
be `Serializable`).
   
   Steps to reproduce:
   
   1. Make `AbstractContractRootDirectoryTest` fail by commenting out the 
`assertDeleted` call inside the loop:
   
   
https://github.com/apache/hadoop/blob/964c1902c8054dfe13c787222a12fb0daf1aaab9/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/contract/AbstractContractRootDirectoryTest.java#L194-L201
   
   2. Run `TestHDFSContractRootDirectory`:
   
   ```
   $ mvn -DfailIfNoTests=false -am -pl :hadoop-hdfs 
-Dtest=TestHDFSContractRootDirectory clean test
   ...
   [ERROR] Tests run: 9, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 
1.708 s <<< FAILURE! - in 
org.apache.hadoop.fs.contract.hdfs.TestHDFSContractRootDirectory
   [ERROR] 
testListEmptyRootDirectory(org.apache.hadoop.fs.contract.hdfs.TestHDFSContractRootDirectory)
  Time elapsed: 0.011 s  <<< FAILURE!
   java.lang.AssertionError: 
   listStatus on empty root-directory returned found: 
   [Lorg.apache.hadoop.fs.FileStatus;@73344c46 expected:<0> but was:<1>
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:647)
        at 
org.apache.hadoop.fs.contract.AbstractContractRootDirectoryTest.testListEmptyRootDirectory(AbstractContractRootDirectoryTest.java:199)
   ```
   
   https://issues.apache.org/jira/browse/HADOOP-18714
   
   ## How was this patch tested?
   
   ```
   $ mvn -DfailIfNoTests=false -am -pl :hadoop-hdfs 
-Dtest=TestHDFSContractRootDirectory clean test
   ...
   ```
   [ERROR] Tests run: 9, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 
1.711 s <<< FAILURE! - in 
org.apache.hadoop.fs.contract.hdfs.TestHDFSContractRootDirectory
   [ERROR] 
testListEmptyRootDirectory(org.apache.hadoop.fs.contract.hdfs.TestHDFSContractRootDirectory)
  Time elapsed: 0.011 s  <<< FAILURE!
   java.lang.AssertionError: listStatus on empty root-directory returned found: 
HdfsLocatedFileStatus{path=hdfs://localhost:37225/test; isDirectory=true; ...} 
expected:<0> but was:<1>
        at org.junit.Assert.fail(Assert.java:89)
        at org.junit.Assert.failNotEquals(Assert.java:835)
        at org.junit.Assert.assertEquals(Assert.java:647)
        at 
org.apache.hadoop.fs.contract.AbstractContractRootDirectoryTest.testListEmptyRootDirectory(AbstractContractRootDirectoryTest.java:199)
   ```


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