Encode testcase name to base64 when name contains forbidden symbols

[ligurio]

luatest has a parametrization feature. Test parameters also used by luatest for building testcase name.
However, parameters can contain symbols not allowed by luatest:

sergeyb@pony:~/sources/MRG/tarantool$ luatest -v test/app-luatest/uri_unit_test.lua                                                         ...ces/MRG/tarantool/test-run/lib/luatest/luatest/group.lua:61: Group name must not contain `/`: uri_url_encode.url:"/".url_encoded:"%2F"   
stack traceback:                                                                                                                            
        ...s/MRG/tarantool/test-run/lib/luatest/luatest/capture.lua:144: in function <...s/MRG/tarantool/test-run/lib/luatest/luatest/captur
e.lua:138>                                                            
        [C]: in function 'error'                                                                                                            
        ...ces/MRG/tarantool/test-run/lib/luatest/luatest/group.lua:61: in function 'initialize'
        ...ces/MRG/tarantool/test-run/lib/luatest/luatest/class.lua:40: in function 'new'                      
        .../tarantool/test-run/lib/luatest/luatest/parametrizer.lua:78: in function 'parametrize'                                           
        ...rces/MRG/tarantool/test-run/lib/luatest/luatest/init.lua:49: in function 'group'
        ...sources/MRG/tarantool/test/app-luatest/uri_unit_test.lua:95: in main chunk
        [C]: in function 'require'

<stripped>

There are at least two workarounds:

• traverse table with parameters inside a test itself, see example - https://github.com/tarantool/tarantool/blob/dc147ec9190fc8bbbe56ce8a4a1718fbf8b03484/test/app-luatest/http_client_unit_test.lua#L62-L102
• parametrize test manually, see example in CRUD tests - https://github.com/tarantool/crud/blob/f1b6a12188f3cd4278fb879afc676b4cd5b5f3ec/test/integration/stats_test.lua#L574-L672

I suggest encoding a problem part of testcase name to base64¹ to avoid such issues.

Footnotes

1. https://www.tarantool.io/en/doc/latest/reference/reference_lua/digest/ ↩