Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2091#issuecomment-53172796
These are _excellent_ unit tests. I ran a coverage report with
[coverage.py](http://nedbatchelder.com/code/coverage/) and it reports
essentially 100% coverage for the driver-side histogram code in rdd.py.
```bash
export PYTHONPATH=$SPARK_HOME/python
coverage run python/pyspark/tests.py TestRDDFunctions.test_histogram
coverage html
```
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