Custom Matchers
As you work with rspec-expectations, you may find yourself wishing for a project-specific should notation to make your assertions more legible. For example, let’s say you wanted to write the following step to test a Book class:
| rspec/examples.rb | |
| | this_book.should please('developers') |
| | |
| | class Book |
| | def pleases?(people) |
| | people == 'developers' |
| | end |
| | end |
rspec-expectations doesn’t ship with a should please() matcher, but you can write a custom matcher and throw it in your env.rb.
| rspec/examples.rb | |
| | RSpec::Matchers.define :please do |people| |
| | match do |book| |
| | book.pleases?(people) |
| | end |
| | end |
When used in moderation, custom matchers can make your Cucumber step definitions easy to read and maintain.
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