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Run single test case to speed up development

When you use common TestUnit (maybe with great gem Shoulda) or RSpec, you may speed up development by running only single test case.
In TestUnit, run test file with `-n` switch:

ruby -n "name_of_test_method" path/to/test_file.rb

or use regexp:

ruby -n "/name of test method/" path/to/test_file.rb

Regexp is very convinient when you work with shoulda.

In Rspec, you can use `-e`:

rspec -e 'name of pattern' path/to/spec_file.rb

Or maybe you would like to install autotest or autospec for Rspec?

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