josevalim/exp.md

## exp.md

      
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              exp.md
            
          
    This is an experiment for possible faster boot time (and consequently faster feedback) when running tests.
I ask your help to try this in your apps (any Rails 3.x app) and let me know how well it works.
How to

Add the following lines inside the configuration block in config/environments/test.rb:
config.cache_classes = true
def eager_load!; end

Notice that config.cache_classes needs to be true (which is the default), some tools may not be fine that. Needless to say, just do this for test environments.
Tests

The following two benches will work only for rspec running from the command line (hopefully you don't use rake to run your specs):


Pick up a spec file that runs all specs under 1s (for example, a file under spec/models or spec/helpers). Run the command below before and after you apply the eager_load! patch above (the bigger your application, the faster it should boot after you apply the patch):
time rspec spec/models/SOME_MODEL_spec.rb


Try running your whole suite with and without the patch. In this case, you shouldn't see any perf difference and everything should work just fine (report if it doesn't!).


Let me know how 1) and 2) goes in the comments section below.