TST: Verify that positional shifting works with duplicate columns (#9…#16810

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jreback merged 1 commit intopandas-dev:masterfrom dsm054:test/shift_dup_column

Jul 2, 2017

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Commits on Jul 1, 2017

TST: Verify that positional shifting works with duplicate columns (pandas-dev#9092 )
dsm054
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