1. Basic tasks - open an archive, open app without
mentioning an archive, close application etc.
2. Open and extract a set of test archives. The set could
have variety by - source of archive (different OSes),
content of archives (text files, binary files, executables,
music files, media files etc.), size of archives (small
file, zero byte file, huge file), number of files in archive
(1, 10, 1000, 10000 etc.). On extracting, check if the
output is fine. Check using MD5 hashes, exe3cute
executables, play media files etc.
3. Now use the extracted sets to create the archives (to
test the archival feature). Compare the archives using MD5
hashes against the original source archives. 
4. Repeat these tests on difference OSes.

-Try to zip a file.
-Try to zip a folder with no file.
-Try to zip different kind of file.
-Try to zip files of different size.
-Try to zip folder with one type of but different size of 
files.
-Try to zip with similar size but different type of files.
-Try to zip with different kind and different size of files.
-Make the recursive folder and check how many folder(one 
inside others) can be zipped successfully.
-Verify all aboe on different OS.
-Provide one zipped file to another zip file
-Verify size of file after zip for all above cases(It 
should match with requirement)
-Check Time taken by zip for zipping any perticular file
(should be match with requirement)
-Maximum no(size) of file it can zipped.
-Unzip all above file and verify content.
-Unzip file and verify timtings
-Unzip file and verify default path.
-Unzip file and verify selective path feature.