rspec-expectations is used to define expected outcomes.
describe Account do it "has a balance of zero when first created" do Account.new.balance.should eq(Money.new(0)) end end
The basic structure of an rspec expectation is:
actual.should matcher(expected) actual.should_not matcher(expected)
should_not to every object in
the system. These methods each accept a matcher as an argument. This allows
each matcher to work in a positive or negative mode:
5.should eq(5) 5.should_not eq(4)
What is a matcher?
A Matcher is any object that responds to the following methods:
These methods are also part of the matcher protocol, but are optional:
does_not_match?(actual) failure_message_for_should_not description
RSpec ships with a number of built-in matchers and a DSL for writing custom matchers.
The documentation for rspec-expectations is a work in progress. We'll be adding Cucumber features over time, and clarifying existing ones. If you have specific features you'd like to see added, find the existing documentation incomplete or confusing, or, better yet, wish to write a missing Cucumber feature yourself, please submit an issue or a pull request.