Hyukjin Kwon created SPARK-17674:
------------------------------------

             Summary: Warnings from SparkR tests being ignored without 
redirecting to errors
                 Key: SPARK-17674
                 URL: https://issues.apache.org/jira/browse/SPARK-17674
             Project: Spark
          Issue Type: Test
          Components: SparkR
            Reporter: Hyukjin Kwon


For example, _currently_ we are having warnings as below:

{code}

```
Warnings -----------------------------------------------------------------------
1. spark.mlp (@test_mllib.R#400) - is.na() applied to non-(list or vector) of 
type 'NULL'

2. spark.mlp (@test_mllib.R#401) - is.na() applied to non-(list or vector) of 
type 'NULL'
```

{code}

This should be errors as specified in 
https://github.com/apache/spark/blob/master/R/pkg/tests/run-all.R#L22 

However, it seems passing the tests fine.

This seems related with the behaciour in `testhat` library. We should 
invesigate and fix. This was also discussed in 
https://github.com/apache/spark/pull/15232



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