def test_hist_noby(self):
'''Test histogram without by variable'''
data = self.idc.merge_by_year(2000)
de = DataExplorer(data, year=2000, by=None)
de.income_histogram()
def test_hist(self):
'''Test histogram with by variable'''
data = self.idc.merge_by_year(2000)
de = DataExplorer(data, year=2000, by="Region")
de.income_histogram()
