Testing/ProtoAlpha/Client: Refactor testing files with better comments in lib_client
Issue #900 (closed) about improving comments for testing files. A new convention exists to document test files (see a draft in #900 (closed), which has been discussed in testing meeting Sept 24, 2020).
For follow-up: unit test function test_unexpand_map_car needs an additional review itself.
Edited by Hai Nguyen Van