add tests for duplicate points
add tests for duplicate points

ChristinaZografou/sympy,chaffra/sympy,kaushik94/sympy,postvakje/sympy,hargup/sympy,ChristinaZografou/sympy,skidzo/sympy,jaimahajan1997/sympy,Curious72/sympy,madan96/sympy,jaimahajan1997/sympy,rahuldan/sympy,souravsingh/sympy,jerli/sympy,Curious72/sympy,drufat/sympy,lindsayad/sympy,mafiya69/sympy,skidzo/sympy,lindsayad/sympy,sampadsaha5/sympy,chaffra/sympy,sampadsaha5/sympy,madan96/sympy,lindsayad/sympy,souravsingh/sympy,kaushik94/sympy,drufat/sympy,rahuldan/sympy,yashsharan/sympy,Titan-C/sympy,yashsharan/sympy,hargup/sympy,souravsingh/sympy,yashsharan/sympy,mafiya69/sympy,postvakje/sympy,kaushik94/sympy,madan96/sympy,Titan-C/sympy,jaimahajan1997/sympy,Titan-C/sympy,skidzo/sympy,sampadsaha5/sympy,rahuldan/sympy,jerli/sympy,drufat/sympy,chaffra/sympy,aktech/sympy,aktech/sympy,mafiya69/sympy,Curious72/sympy,jerli/sympy,aktech/sympy,postvakje/sympy,hargup/sympy,ChristinaZografou/sympy