Create unittest to avoid repeating excessive closing
Create unittest to avoid repeating excessive closing

"Thou shalst not close file handles that SHE, your caller, has given you!"

Ensure we comply with this dogma.

nolze/msoffcrypto-tool,nolze/msoffcrypto-tool,nolze/ms-offcrypto-tool,nolze/ms-offcrypto-tool