def test_pdf_return_types(transition: Transition):
df, w = data(20)
transition.fit(df, w)
single = transition.pdf(df.iloc[0])
multiple = transition.pdf(df)
assert isinstance(single, float)
assert multiple.shape == (20,)
def test_argument_order(transition: Transition):
"""
Dataframes passed to the transition kernels are generated from dicts.
Order of parameter names is no guaranteed.
The Transition kernel has to take care of the correct sorting.
"""
df, w = data(20)
transition.fit(df, w)
test = df.iloc[0]
reversed = test[::-1]
# works b/c of even nr of parameters
assert (np.array(test) != np.array(reversed)).all()
assert transition.pdf(test) == transition.pdf(reversed)