issue:112: RqMultipart is not tested properly. Added missing unit test to cover all edge cases
issue:112: RqMultipart is not tested properly. Added missing unit test to cover all edge cases

bdragan/takes,essobedo/takes,bdragan/takes,hs3180/takes,xupyprmv/takes,antonini/takes,erimerturk/takes,mstzn36/takes,georgeyanev/takes,essobedo/takes,RamIndani/takes,antonini/takes,ikhvostenkov/takes,xupyprmv/takes,Bertram25/takes,RamIndani/takes,pecko/takes,hs3180/takes,pecko/takes,mstzn36/takes,georgeyanev/takes,simonjenga/takes,dalifreire/takes,simonjenga/takes,dalifreire/takes,erimerturk/takes,yegor256/takes,Bertram25/takes,ikhvostenkov/takes,yegor256/takes