Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9232#discussion_r43233453
  
    --- Diff: 
yarn/src/test/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtilSuite.scala 
---
    @@ -245,4 +247,55 @@ class YarnSparkHadoopUtilSuite extends SparkFunSuite 
with Matchers with Logging
           System.clearProperty("SPARK_YARN_MODE")
         }
       }
    +
    +  test("Obtain tokens For HiveMetastore") {
    +    val hadoopConf = new Configuration()
    +    hadoopConf.set("hive.metastore.kerberos.principal", "bob")
    +    // thrift picks up on port 0 and bails out, without trying to talk to 
endpoint
    +    hadoopConf.set("hive.metastore.uris", "http://localhost:0";)
    +    val util = new YarnSparkHadoopUtil
    +    val e = intercept[InvocationTargetException] {
    +      util.obtainTokenForHiveMetastoreInner(hadoopConf, "alice")
    +    }
    +    assertNestedHiveException(e)
    +    // expect exception trapping code to unwind this hive-side exception
    +    assertNestedHiveException(intercept[InvocationTargetException] {
    +      util.obtainTokenForHiveMetastore(hadoopConf)
    +    })
    +  }
    +
    +  def assertNestedHiveException(e: InvocationTargetException): Throwable = 
{
    +    val inner = e.getCause
    +    if (inner == null) {
    +      fail("No inner cause", e)
    +    }
    +    if (!inner.isInstanceOf[HiveException]) {
    +      fail(s"Not a hive exception", inner)
    +    }
    +    inner
    +  }
    +
    +  test("handleTokenIntrospectionFailure") {
    +    val util = new YarnSparkHadoopUtil
    +    // downgraded exceptions
    +    util.handleTokenIntrospectionFailure("hive", new 
ClassNotFoundException("cnfe"))
    --- End diff --
    
    Following my previous comment, you could get rid of this whole test case if 
you just do exception handling in the caller method. If you really want to test 
that CNFE is ignored, you could use Mockito's `spy` to mock 
`obtainTokenForHiveMetastoreInner` and make it throw a CNFE. The other tests 
here are not really that interesting anymore.


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