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Cucumber helpers

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Kelp
====

[Kelp](http://github.com/wapcaplet/kelp) is a collection of helpers that makes
it easier to write step definitions for [Cucumber](http://cukes.info). The Kelp
gem is hosted on [Rubygems](http://rubygems.org/gems/kelp), so you can install
it with:

$ gem install kelp

The name "Kelp" is a contraction of "Cuke Helpers". It was chosen because it's
short, easy to remember, and is in keeping with the theme of greenish plants.
Kelp is licensed under the
[MIT License](http://www.opensource.org/licenses/mit-license.php).

Documentation is
[available on rdoc.info](http://rdoc.info/github/wapcaplet/kelp/master/frames).
Please use the [issue tracker](http://github.com/wapcaplet/kelp/issues)
to report any bugs or feature requests. Visit the `#kelp` channel on
`irc.freenode.net` to chat.

Motivation
----------

Kelp was developed as an attempt to get away from the bad habit of nesting
steps inside one another. While Cucumber does allow this behavior, it is
frowned upon by much of the Cucumber community. It was also partly motivated by
a desire to move away from imperative steps, toward a
[more declarative style](http://automation-excellence.com/blog/declare-or-impair).
Some of Capybara's methods were perceived as being too low-level, especially
when it comes to filling in or verifying several different fields in a form, or
checking the presence or absence of multiple strings or regular expressions.

As of version 1.1.0, cucumber-rails
[no longer provides](http://aslakhellesoy.com/post/11055981222/the-training-wheels-came-off)
a generator for `web_steps.rb`; since Kelp does provide such a generator, it
may serve the niche market of cucumber-rails users who preferred to use the
imperative step definitions that it provided. Kelp's intent is not to encourage
this behavior; nearly all of the imperative steps it provides are one-liners,
which in many cases are more succinct and readable than the step definition
that wraps them.

It is this developer's opinion that imperative `web_steps.rb`-style steps can
be the easiest route to a working Cucumber scenario, but that they can also
be a fast track to unmaintainability. Consider them a starting point; the baby
steps you might take when writing your first few scenarios, before you discover
the higher-level declarative steps that need to be reusably encapsulated.

Usage
-----

To use Kelp's helpers in your Cucumber step definitions, simply `require` the
helper module you're interested in:

require 'kelp/visibility'

Then add the relevant modules to Cucumber's `World`:

World(Kelp::Visibility)

Or, to include all available helpers:

require 'kelp/attribute'
    require 'kelp/checkbox'
    require 'kelp/dropdown'
    require 'kelp/field'
    require 'kelp/navigation'
    require 'kelp/scoping'
    require 'kelp/visibility'

World(Kelp::Attribute)
    World(Kelp::Checkbox)
    World(Kelp::Dropdown)
    World(Kelp::Field)
    World(Kelp::Navigation)
    World(Kelp::Scoping)
    World(Kelp::Visibility)

Many of the provided helpers are designed to make it easier to do things you
might otherwise be tempted to do with nested step definitions. For example, if
you need to verify the presence of several text strings on a webpage, you might
have a step definition like this:

Then /^I should see the login page$/ do
      Then %{I should see "Welcome"}
      And %{I should see "Thanks for visiting"}
      And %{I should see "Login"}
    end

Using the provided helper method `should_see`, you can do this instead:

Then /^I should see the login page$/ do
      should_see "Welcome"
      should_see "Thanks for visiting"
      should_see "Login"
    end

Or even this:

Then /^I should see the login page$/ do
      should_see [
        "Welcome",
        "Thanks for visiting",
        "Login"
      ]
    end

Following links, filling in fields, and pressing buttons can all be easily done
with Ruby code instead of nested steps. Thus this:

When %{I follow "Login"}
    And %{I fill in "Username" with "skroob"}
    And %{I fill in "Password" with "12345"}
    And %{I press "Log me in"}

translates to this:

follow "Login"
    fill_in_fields \
      "Username" => "skroob",
      "Password" => "12345"
    press "Log me in"

Several methods also accept keywords to define the scope of an action. For
instance, if you want to look within an element with id="greeting"`, do:

should_see "Welcome", :within => "#greeting"

At the moment, the `:within` keyword is the only accepted scope; the locator
you pass to this should be in whatever format your `Capybara.default_selector`
is set to. Other keywords like `:before` or `:after` may be supported in future
revisions.

See the
[kelp documentation](http://rdoc.info/github/wapcaplet/kelp/master/frames).
for more information.

Rails generator
---------------

Kelp provides a generator for Rails projects, which writes step definitions
to `features/step_definitions/web_steps.rb`. This file provides all of the same
step definitions formerly provided by
[cucumber-rails](http://github.com/aslakhellesoy/cucumber-rails), with several
enhancements. If you have made customizations to your `web_steps.rb`, they will
be overwritten! Consider yourself warned.

To generate `web_steps.rb`, run this for Rails 2.x:

$ script/generate kelp

Or this for Rails 3.x:

$ rails generate kelp:steps

*Note*: If you are upgrading from a version of Kelp prior to 0.1.9, you should
remove `kelp_steps.rb` from your `features/step_definitions` directory; these
are obsolete, and conflict with the newer step definitions in `web_steps.rb`.

Development
-----------

If you'd like to hack on Kelp, first fork the
[repository](http://github.com/wapcaplet/kelp),
then clone your fork:

$ git clone git://github.com/your_username/kelp.git

Install [bundler](http://gembundler.com/):

$ gem install bundler

Then install Kelp's dependencies:

$ cd /path/to/kelp
    $ bundle install

It's a good idea to use [RVM](http://rvm.beginrescueend.com/)
with a new gemset to keep things tidy.

If you make changes that you'd like to share, push them into your Kelp fork,
then [submit a pull request](http://github.com/wapcaplet/kelp/pulls).

Testing
-------

Kelp comes with a `Rakefile`, so you can run the RSpec tests and generate an
[rcov](http://eigenclass.org/hiki.rb?rcov) coverage report via:

$ rake spec

This will write an HTML report to `coverage/index.html`. Finally, there are
some Cucumber self-tests included, mainly for testing the `web_steps.rb`
file used by the Rails generator. Run via:

$ rake cucumber

This self-test includes high-level scenarios that exercise more detailed
scenarios in `examples/sinatra_app/features`, ensuring that the generated step
definitions perform as expected.

Future plans
------------

* Support Webrat

The MIT License

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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