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Feature: Transforms
If you see certain phrases repeated over and over in your step definitions, you can
use transforms to factor out that duplication, and make your step definitions simpler.
Background:
Let's just create a simple feature for testing out Transforms.
We also have a Person class that we need to be able to build.
Given a file named "features/foo.feature" with:
"""
Feature:
Scenario:
Given a Person aged 15 with blonde hair
"""
And a file named "features/support/person.rb" with:
"""
class Person < Struct.new(:age)
def to_s
"I am #{age} years old"
end
end
"""
Scenario: Basic Transform
This is the most basic way to use a transform. Notice that the regular
expression is pretty much duplicated.
And a file named "features/step_definitions/steps.rb" with:
"""
Transform(/a Person aged (\d+)/) do |age|
Person.new(age.to_i)
end
Given /^(a Person aged \d+) with blonde hair$/ do |person|
puts "#{person} and I have blonde hair"
end
"""
When I run cucumber "features/foo.feature"
Then it should pass with:
"""
I am 15 years old and I have blonde hair
"""
Scenario: Re-use Transform's Regular Expression
If you keep a reference to the transform, you can use it in your
regular expressions to avoid repeating the regular expression.
And a file named "features/step_definitions/steps.rb" with:
"""
A_PERSON = Transform(/a Person aged (\d+)/) do |age|
Person.new(age.to_i)
end
Given /^(#{A_PERSON}) with blonde hair$/ do |person|
puts "#{person} and I have blonde hair"
end
"""
When I run cucumber "features/foo.feature"
Then it should pass with:
"""
I am 15 years old and I have blonde hair
"""
|
