Using Aruba’s Ruby DSL
Aruba’s step definitions are a great example of how step definitions should be written. Each of them is hardly ever more than a single line long, delegating all its work to Ruby methods in Aruba’s support layer module Aruba::API. We can call these methods directly from our own step definitions, removing an unnecessary layer of indirection in our code. Here’s how the features/step_definitions/calculator_steps.rb file looks with each of the Aruba step definitions translated to their underlying method calls:
| command_line_applications/12/features/step_definitions/calculator_steps.rb | |
| | Given /^the input "([^"]*)"$/ do |input| |
| | write_file 'input.txt', input |
| | end |
| | When /^the calculator is run$/ do |
| | run 'calculator input.txt' ... |
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