code: def histogram_input_argument_tests():
      options = {
          "barmode": ["stack"],
          "bins": [20],
          "orientation": ["h", "v"],
          "histnorm": ["probability", "percent", "density"],
          "subplots": [True],
          "line_color": ["blue", "#fa0"],
      }
  
      def histogram_test(self, **kwargs):
          self._iplot(self.df, kind="histogram", **kwargs)
  
      _generate_tests(TestIPlot, histogram_test, "histogram", options)
  
imports: import cufflinks
  import pandas
  import numpy
  import unittest
  from nose.tools import assert_equals
label_desc: Use image node_id 4 for calling a global function with example usage: histogram_input_argument_tests() without return types