Use pytest.fixture for backends
Use pytest.fixture for backends

This lets you chain in additional fixtures that vary by backend easily.

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