add test for null char replacement
add test for null char replacement

Ayrx/cryptography,skeuomorf/cryptography,Lukasa/cryptography,kimvais/cryptography,Lukasa/cryptography,dstufft/cryptography,Lukasa/cryptography,kimvais/cryptography,sholsapp/cryptography,skeuomorf/cryptography,Ayrx/cryptography,kimvais/cryptography,skeuomorf/cryptography,skeuomorf/cryptography,Hasimir/cryptography,sholsapp/cryptography,dstufft/cryptography,bwhmather/cryptography,sholsapp/cryptography,kimvais/cryptography,Hasimir/cryptography,dstufft/cryptography,bwhmather/cryptography,sholsapp/cryptography,dstufft/cryptography,bwhmather/cryptography,bwhmather/cryptography,Hasimir/cryptography,Ayrx/cryptography,dstufft/cryptography,Hasimir/cryptography,Ayrx/cryptography