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资源说明：Lazy coverage-aware running of Cucumber acceptance tests
# Cucover
Cucover is a thin wrapper for [Cucumber](http://github.com/aslakhellesoy/cucumber/tree/master) which makes it lazy.
>> Question:
>> What does it mean for Cucumber to be lazy?
> Answer:
> It will only run a scenario if it needs to.
How does it decide whether it needs to run a scenario? Every time you run a feature using Cucover, it watches the code in your application that is executed, and remembers. The next time you run Cucover, it skips a scenario if the source files (or the feature itself) have not been changed since it was last run.
## Features
* Within a feature, Cucover will only re-run the Scenarios that have been affected by your changes
* Uses RCov to map features to covered source files
* Patches Rails to also map scenarios to covered .erb view templates
* Shows skipped Scenarios, for confidence
* Re-runs failing features, even when nothing has changed, for that good old red-bar feel.
* Allows you to see which lines of a source file are tested by which scenarios
## Installation and Usage
sudo gem install mattwynne-cucover --source http://gems.github.com
To run your features lazily, use the cucover binary instead of cucumber:
cucover -- features/lamb_chops.feature
To see what Cucover has already recorded (in the cucover.data file):
cucover --show-recordings
To find out which tests cover which lines of a given source file:
cucover --coverage_of path/to/some_source_file.rb
## Limitations
* Anything that runs out of process will not be covered, and therefore cannot trigger a re-run, so if you use Cucumber to drive Selenium, for example, you're out of luck.
* This is very new and experimental. There may be bugs. Feedback is welcome via github messages.
## Todo
* Proper args parsing and command-line help
* Work on a way to include coverage from out-of-process ruby code run during a test
* Speed up the whole thing by only writing the recordings to disk when the process exits
* Run code coverage and remove any slop following refactoring
* Speed up the Rails test - maybe strip some guff out of the environment load?
## Similar 'Selective Testing' Tools
* JTestMe
* http://xircles.codehaus.org/projects/jtestme
* [Agile2008 conference submission](http://submissions.agile2008.org/node/3435)
* Infinitest
* http://code.google.com/p/infinitest/
* Contact: [Ben Rady](http://submissions.agile2008.org/node/377)
* Google Testar
* http://code.google.com/p/google-testar/
* Contact: Misha Dmitriev
* Clover test optimization
* http://www.atlassian.com/software/clover/features/optimization.jsp
* JUnitMax
* a selective testing tool by [Kent Beck](http://www.threeriversinstitute.org/blog)
* http://junitmax.com/
## Authors
* Matt Wynne
* Joseph Wilk
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