The test data is generated as follows:
$ mkdir dir
$ base64 /dev/urandom | head -c 100000 > dir/file1
$ base64 /dev/urandom | head -c 100000 > dir/file2
$ soong_zip -o test.zip -D dir
Running zipinfo shows that the files are compressed using deflate (defN)
$ zipinfo test.zip
Archive: test.zip
Zip file size: 151594 bytes, number of entries: 2
-rw------- 2.0 unx 100000 bl defN 08-Jan-01 00:00 dir/file1
-rw------- 2.0 unx 100000 bl defN 08-Jan-01 00:00 dir/file2
2 files, 200000 bytes uncompressed, 151352 bytes compressed: 24.3%
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