gistfile1.txt

legolas:purely_functional_data_structures cowboyd$ rake cucumber
(in /Users/cowboyd/Projects/purely_functional_data_structures)
/opt/local/bin/ruby -I "/Users/cowboyd/Projects/cucumber/lib:lib" "/Users/cowboyd/Projects/cucumber/bin/cucumber" 
Using the default profile...
Feature: Adding Lists

  Scenario: adding to an empty list yields second list # features/adding_lists.feature:3
    Given an empty list "list1"                        # 
    And an empty list "list2"                          # 
    When I cons "2" to "list2"                         # 
    And I add "list1" and "list2"                      # 
    Then the sum should equal "list2"                  # 

  Scenario: second list is empty yields first list # features/adding_lists.feature:10
    Given an empty list "list1"                    # 
    And an empty list "list2"                      # 
    When I cons "2" to "list1"                     # 
    And I add "list1" and "list2"                  # 
    Then the sum should equal "list1"              # 

  Scenario: Adding single-element list                  # features/adding_lists.feature:17
    Given an empty list "list1"                         # 
    And an empty list "list2"                           # 
    When I cons "1" to "list1"                          # 
    And I cons "2" to "list2"                           # 
    And I add "list1" and "list2"                       # 
    Then the head of the sum equals the head of "list1" # 
    Then the tail of the sum equals "list2"             # 

  Scenario: Multiple element lists   # features/adding_lists.feature:26
    Given "1,2" as "list1"           # 
    Given "2,3" as "list2"           # 
    When I add "list1" and "list2"   # 
features/support/env.js:71: Uncaught Expected <'1, 2, 2, 3', > but got <'1, 2', '2, 3', >
    Then the sum should be "1,2,2,3" # 

Feature: Creating a list from an array

  Scenario: Empty array yields empty list # features/create_list_from_array.feature:3
    Given "" as a list                    # 
features/support/env.js:71: Uncaught Expected <true> but got <false>
    Then it should be empty               # 

  Scenario: Single element  # features/create_list_from_array.feature:7
    Given "1" as a list     # 
features/support/env.js:71: Uncaught Expected <'1, '> but got <'1', >
    Then it should be "1, " # 

  Scenario: head is 1           # features/create_list_from_array.feature:11
    Given "1,2,3" as a list     # 
features/support/env.js:71: Uncaught Expected <'1'> but got <'1>
    Then the head should be "1" # 

  Scenario: second item initialized         # features/create_list_from_array.feature:15
    Given "1,2,3" as a list                 # 
features/support/env.js:71: Uncaught Expected <'2'> but got <2>
    Then the head of the tail should be "2" # 

Feature: Lists

  Background: Set up the list # features/list_basic_operations.feature:3
    Given an empty list       # 

  Scenario: empty list is empty # features/list_basic_operations.feature:6
    Then it should be empty     # 

  Scenario: cons makes list not empty # features/list_basic_operations.feature:9
    When I cons "1"                   # 
    Then it should not be empty       # 

  Scenario: head returns what was just cons-ed # features/list_basic_operations.feature:13
    When I cons "a"                            # 
    Then the head should be "a"                # 

  Scenario: empty list has undefined head # features/list_basic_operations.feature:17
    Then the head should be undefined     # 

  Scenario: empty list has undefined tail # features/list_basic_operations.feature:20
    Then the tail should be undefined     # 

  Scenario: cons-ed list has empty tail # features/list_basic_operations.feature:23
    When I cons "foo"                   # 
    Then the tail should be empty       # 

  Scenario: getting the head of the tail      # features/list_basic_operations.feature:27
    When I cons "foo"                         # 
    And I cons "bar"                          # 
    Then the head of the tail should be "foo" # 

  Scenario: toString for single element # features/list_basic_operations.feature:32
    When I cons "foo"                   # 
features/support/env.js:71: Uncaught Expected <'foo, '> but got <'foo', >
    Then it should be "foo, "           # 

Feature: Updating Lists

  Scenario: Updating a single element list # features/updating_lists.feature:3
    Given the list "1"                     # features/updating_lists.feature:4
    When I update item 1 to "b"            # features/updating_lists.feature:5
    Then it should be "1, "                # 

17 scenarios (1 undefined, 16 passed)
54 steps (1 skipped, 2 undefined, 51 passed)
0m2.012s

You can implement step definitions for undefined steps with these snippets:

Given (/^the list "([^\"]*)"$/, function(arg1){
    //express the regexp above with the code you wish you had
});

When (/^I update item 1 to "([^\"]*)"$/, function(arg1){
    //express the regexp above with the code you wish you had
});