[SPARK-23539][SS][FOLLOWUP][TESTS] Add UT to ensure existing query doesn't break with default conf of includeHeaders#25792

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HeartSaVioR:SPARK-23539-FOLLOWUP

Commits on Sep 15, 2019

[SPARK-23539][SS][FOLLOWUP] Add UT to ensure existing query doesn't break with default conf of includeHeaders
HeartSaVioR
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Remove unused import
HeartSaVioR
committed