[TST]: Groupby raised error with duplicate column names (#36389)
[TST]: Groupby raised error with duplicate column names (#36389)


pandas-dev/pandas,jorisvandenbossche/pandas,datapythonista/pandas,jreback/pandas,dsm054/pandas,jorisvandenbossche/pandas,pandas-dev/pandas,jreback/pandas,dsm054/pandas,gfyoung/pandas,dsm054/pandas,jreback/pandas,gfyoung/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,gfyoung/pandas,gfyoung/pandas,rs2/pandas,datapythonista/pandas,gfyoung/pandas,pandas-dev/pandas,rs2/pandas,jreback/pandas,dsm054/pandas,rs2/pandas,rs2/pandas,datapythonista/pandas,jorisvandenbossche/pandas,datapythonista/pandas,dsm054/pandas,jreback/pandas