added tests for compogen function
added tests for compogen function

postvakje/sympy,postvakje/sympy,kaushik94/sympy,jaimahajan1997/sympy,drufat/sympy,madan96/sympy,souravsingh/sympy,chaffra/sympy,aktech/sympy,skidzo/sympy,madan96/sympy,drufat/sympy,skidzo/sympy,aktech/sympy,aktech/sympy,madan96/sympy,sampadsaha5/sympy,yashsharan/sympy,drufat/sympy,sampadsaha5/sympy,jaimahajan1997/sympy,chaffra/sympy,skidzo/sympy,sampadsaha5/sympy,chaffra/sympy,souravsingh/sympy,jaimahajan1997/sympy,yashsharan/sympy,kaushik94/sympy,postvakje/sympy,yashsharan/sympy,kaushik94/sympy,souravsingh/sympy