def test_which_array(self):
rea = Realism()
x = np.array(['a','b','c'])
idx = 1
item = x[idx]
assert idx == rea.which(x,item)[0]
def test_which_list(self):
rea = Realism()
x = ['a','b','c']
idx = 1
item = x[idx]
assert idx == rea.which(x, item)[0]