add some unit tests for raection GPR's
add some unit tests for raection GPR's

aebrahim/cobrapy,aebrahim/cobrapy,JuBra/cobrapy,zakandrewking/cobrapy,jeicher/cobrapy,zakandrewking/cobrapy,jerkos/cobrapy,jeicher/cobrapy,jerkos/cobrapy,JuBra/cobrapy