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

    https://github.com/apache/spark/pull/18746#discussion_r131258120
  
    --- Diff: python/pyspark/ml/tests.py ---
    @@ -1957,6 +1987,24 @@ def test_chisquaretest(self):
             self.assertTrue(all(field in fieldNames for field in 
expectedFields))
     
     
    +class UnaryTransformerTests(SparkSessionTestCase):
    +
    +    def test_unary_transformer_transform(self):
    +        shiftVal = 3
    +        transformer = MockUnaryTransformer(shiftVal=shiftVal)\
    +            .setInputCol("input").setOutputCol("output")
    +
    +        df = self.spark.range(0, 10).toDF('input')
    +        df = df.withColumn("input", df.input.cast(dataType="double"))
    +
    +        transformed_df = transformer.transform(df)
    +        output = transformed_df.select("output").collect()
    --- End diff --
    
    It's better practice to select both input & output and collect both for 
comparison, rather than relying on DataFrame rows maintaining their order.


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