[Trema] Try the cucumber scenarios in Trema

When you install Trema ready, you can try this in Trema path:
trema> sudo cucumber -r features

And then you will get a lot of log and info on screen. For instance, this is what I got:

Failing Scenarios:
cucumber features/example.message.echo_reply.feature:8 # Scenario: Send echo reply x 10
cucumber features/example.message.echo_reply.feature:18 # Scenario: Send echo reply x 10 in Ruby
cucumber features/example.message.echo_request.feature:8 # Scenario: Send echo request x 10
cucumber features/example.message.echo_request.feature:18 # Scenario: Send echo request x 10 in Ruby
cucumber features/example.message.features_request.feature:8 # Scenario: Send a features request
cucumber features/example.message.features_request.feature:48 # Scenario: Send a features request in Ruby
cucumber features/example.message.hello.feature:8 # Scenario: Hello trema
cucumber features/example.message.hello.feature:18 # Scenario: Hello trema in Ruby
cucumber features/example.message.set_config.feature:8 # Scenario: set config x 10
cucumber features/example.message.set_config.feature:19 # Scenario: set config x 10 in Ruby
cucumber features/example.packetin_filter_config.feature:8 # Scenario: add filter
cucumber features/example.packetin_filter_config.feature:23 # Scenario: dump filter
cucumber features/example.packetin_filter_config.feature:40 # Scenario: dump filter strict
cucumber features/example.packetin_filter_config.feature:62 # Scenario: delete filter strict
cucumber features/example.packetin_filter_config.feature:83 # Scenario: delete filter
cucumber features/packetin_filter.feature:8 # Scenario: packetin_filter --help
cucumber features/packetin_filter.feature:33 # Scenario: packetin_filter -h
cucumber features/switch_manager.feature:8 # Scenario: switch_manager --help
cucumber features/switch_manager.feature:26 # Scenario: switch_manager -h

84 scenarios (19 failed, 65 passed)

417 steps (19 failed, 47 skipped, 351 passed)

7m0.821s

Or if you want to further test Trema/Apps, for instance, sliceable_switch app, you can do this:
trema> sudo cucumber -r features -r ../apps/sliceable_switch/features /home/liudanny/SourceCode/apps/sliceable_switch/features/port_binding.feature
But, I am not sure it is correct way or not and will figure it out.

[Cucumber] how to use cucumber with a simple example

As my early post  [Cucumber] An brief introduction, Cucumber is an amazing testing tool and it is about Behaviour-Driven Development instead of Test-Driven Development. 

The book "The Cucumber Book" gives a very good explanation and useful of examles to illustrate the usages and functionalities in depths.

Based on that book's a good simple example, the following picture give the dictionary structure (left hand side ) and 3 of important files ( right hand side ) as follows:

"adding.feature" is file contained scenario ( test case )
"calc.rb" provides the calculation function for calculator_steps.rb
" calculator_steps.rb" provide the functions mapping to feature's script based on the key words: Given, When, and Then

Under the path, we run "cucumber" and then get the information as below:

Feature: Adding

  Scenario Outline: Add two numbers      # features/adding.feature:3
    Given the input "<input>"            # features/step_definitions/calculator_steps.rb:9
    When the calculator is run           # features/step_definitions/calculator_steps.rb:13
    Then the output should be "<output>" # features/step_definitions/calculator_steps.rb:18

    Examples:
      | input | output |
      | 2+2    | 4          |
      | 98+1  | 99        |

2 scenarios (2 passed)
6 steps (6 passed)
0m0.012s

[Cucumber] An brief introduction

http://cukes.info/
I just saw the "Cucumber" and was amazed by its power of scenario testing with human-readable syntax and sentences. It is so amazing...
If you guys want to do the job for testing, that is a good choice~

For more information in details, please also check it out:
http://andrewvos.com/2011/06/15/writing-better-cucumber-features/
http://grosser.it/2008/12/25/getting-started-with-cucumber-on-ubuntu/
http://jeannotsweblog.blogspot.tw/search?q=cucumber
http://holmwood.id.au/~lindsay/2009/11/09/behaviour-driven-infrastructure-through-cucumber/

How to install Cucumber
sudo apt-get install libxslt1-dev libxml2-dev racc
sudo apt-get install gem
sudo gem install gherkin
sudo gem install cucumber./script/generate cucumber
rake features