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A Drop Dead Stupid Rails Testing Trick
source link: https://fuzzyblog.io/blog/rails/2020/03/19/a-drop-dead-stupid-rails-testing-trick.html
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A Drop Dead Stupid Rails Testing Trick
Mar 19, 2020
This is an old school trick that you use when you don't have a robust test suite and / or a CI environment. When you run Rails in development mode it is VERY, VERY forgiving of little details like syntax errors – the type of thing that grind your web server to a hard stop.
The trick is to use RAILS_ENV=production in development mode and that causes syntax errors to get caught:
RAILS_ENV=production bundle exec rails s -p3169
Here's an example stack trace:
20: from /Users/sjohnson/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0/tsort.rb:228:in `block in tsort_each'
19: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/railties-6.0.2.1/lib/rails/initializable.rb:61:in `block in run_initializers'
18: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/railties-6.0.2.1/lib/rails/initializable.rb:32:in `run'
17: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/railties-6.0.2.1/lib/rails/initializable.rb:32:in `instance_exec'
16: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/railties-6.0.2.1/lib/rails/application/finisher.rb:122:in `block in <module:Finisher>'
15: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:449:in `eager_load_all'
14: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:449:in `each'
13: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:338:in `eager_load'
12: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:338:in `synchronize'
11: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:346:in `block in eager_load'
10: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:682:in `ls'
9: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:682:in `foreach'
8: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:685:in `block in ls'
7: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:351:in `block (2 levels) in eager_load'
6: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/loader.rb:351:in `const_get'
5: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/zeitwerk-2.2.2/lib/zeitwerk/kernel.rb:16:in `require'
4: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
3: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
2: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
1: from /Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
/Users/sjohnson/.rvm/gems/ruby-2.7.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require': /Users/sjohnson/Sync/coding/rails/covid_morbidity/app/controllers/symptoms_controller.rb:53: syntax error, unexpected local variable or method, expecting '}' (SyntaxError)
ip_address: request.remote_ip,
^~~~~~~~~~
/Users/sjohnson/Sync/coding/rails/covid_morbidity/app/controllers/symptoms_controller.rb:54: syntax error, unexpected tLABEL, expecting '='
user_agent: request.user_agent
^~~~~~~~~~~
/Users/sjohnson/Sync/coding/rails/covid_morbidity/app/controllers/symptoms_controller.rb:55: syntax error, unexpected '}', expecting `end'
}
^
Ideally you would never have to do this but it really can be a useful trick when you don't have a full CI environment setup.
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