fixed tests for assingment function
fixed tests for assingment function

abinashpanda/pgmpy,kris-singh/pgmpy,liquidmetal/pgmpy,anaviltripathi/pgmpy,ankurankan/pgmpy,khalibartan/pgmpy,liquidmetal/pgmpy,yashu-seth/pgmpy,khalibartan/pgmpy,ankurankan/pgmpy,pgmpy/pgmpy,pgmpy/pgmpy,sandeepkrjha/pgmpy,jhonatanoliveira/pgmpy,sandeepkrjha/pgmpy,kris-singh/pgmpy,abinashpanda/pgmpy,anaviltripathi/pgmpy,yashu-seth/pgmpy,jhonatanoliveira/pgmpy