RSpec matcher to check that an expression changed its result within arbitrary seconds.
async_task.start!
expect { async_task.finished? }.to become(true)Add this line to your application's Gemfile:
gem 'rspec-become-matcher'And then execute:
$ bundle
Or install it yourself as:
$ gem install rspec-become-matcher
Require and include matcher first:
require 'rspec/become_matcher'
RSpec.configure do |config|
config.include RSpec::BecomeMatcher
endThen, asynchronous behaviour can be tested like this:
# Start some asynchronous task
async_task.start!
# `become` matcher checks the task is `finished?` periodically
expect { async_task.finished? }.to become(true) # => PASS
# Start long asynchronous task
long_task.start!
# By default, `become` matcher waits 3 seconds
expect { long_task.finished? }.to become(true) # => FAIL
# Start long asynchronous task, which finishes in 5 seconds
another_long_task.start!
# Timeout seconds can be specified with `in`
expect { another_long_task.finished? }.to become(true).in(10) # => PASS
# Expectation can be specified with block
yet_another_long_task.start!
expect { yet_another_long_task }.to become { |task| task.finished? } # => PASSBug reports and pull requests are welcome on GitHub at https://github.com/fujimura/rspec-become-matcher. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.
The gem is available as open source under the terms of the MIT License.
Everyone interacting in the Rspec::Become::Matcher project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.