Reduce gem size by excluding test files

[yuri-zubov]

$ gem build -o before

$ git switch reduce-gem-size

$ gem build -o after

$ du -sh before after
 40K	before
 28K	after

	before	after	saved
size	40K	28K	-12K ($\textcolor{green}{⏷}$ -30.00%)

[knu]

Can you define the list with exclusion? I'd like to see what's being excluded.

[yuri-zubov]

@knu I have just deleted tests and github-ci

 data
-├── .github
-│   ├── CODEOWNERS
-│   └── workflows
-│       └── ci.yml
-├── .gitignore
 ├── CHANGELOG.md
-├── Gemfile
-├── http-cookie.gemspec
 ├── lib
 │   ├── http
 │   │   ├── cookie
 │   │   │   ├── ruby_compat.rb
 │   │   │   ├── scanner.rb
 │   │   │   ├── uri_parser.rb
 │   │   │   └── version.rb
 │   │   ├── cookie_jar
 │   │   │   ├── abstract_saver.rb
 │   │   │   ├── abstract_store.rb
 │   │   │   ├── cookiestxt_saver.rb
 │   │   │   ├── hash_store.rb
 │   │   │   ├── mozilla_store.rb
 │   │   │   └── yaml_saver.rb
 │   │   ├── cookie_jar.rb
 │   │   └── cookie.rb
 │   └── http-cookie.rb
 ├── LICENSE.txt
-├── Rakefile
 ├── README.md
-└── test
-    ├── helper.rb
-    ├── mechanize.yml
-    ├── simplecov_start.rb
-    ├── test_http_cookie_jar.rb
-    └── test_http_cookie.rb

[yuri-zubov]

@knu what are you doubting?
A lot of gems like rails, rspec don't add test files