README.md

RSpec Around All/Context

Provides around(:all)/around(:context) hooks for RSpec.

Usage

In your Gemfile:

gem 'rspec_around_context', git: 'git://gist.github.com/2005175.git'

In a spec:

require 'rspec_around_context'

describe "MyClass" do
  around(:context) do |group|
    # do something before
    group.run_examples
    # do something after
  end

  # or...
  around(:context) do |group|
    transactionally(&group)
  end
end

You may want to check out my blog post about this.

Copyright

Copyright (c) 2012-2020 Myron Marston. Released under the terms of the MIT license. See LICENSE for details.

LICENSE

(The MIT License)

Copyright (c) 2012-2020 Myron Marston

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

rspec_around_context.gemspec

Gem::Specification.new do |s|
  s.name        = 'rspec_around_context'
  s.version     = '0.2.0'
  s.platform    = Gem::Platform::RUBY
  s.author      = 'Myron Marston'
  s.email       = '[email protected]'
  s.summary     = 'Provides around(:context) hook for RSpec'
  s.license     = 'MIT'

  s.files         = ['rspec_around_context.rb', 'LICENSE']
  s.test_file     = 'rspec_around_context_spec.rb'
  s.require_path  = '.'

  s.add_dependency 'rspec', "~> 3.0"

  s.required_ruby_version = '>= 1.9.2'
end

rspec_around_context.rb

require 'delegate'
require 'fiber'

module RSpecAroundContext
  class FiberAwareGroup < SimpleDelegator
    def run_examples
      Fiber.yield
    end

    def to_proc
      proc { run_examples }
    end
  end

  def around(scope, *args, &block)
    # let RSpec handle around(:each) hooks...
    return super(scope, *args, &block) unless scope == :all || scope == :context

    group, fiber = self, nil
    before(scope, *args) do
      fiber = Fiber.new(&block)
      fiber.resume(FiberAwareGroup.new(group))
    end

    after(scope, *args) do
      fiber.resume
    end
  end
end

RSpec.configure do |c|
  c.extend RSpecAroundContext
end

rspec_around_context_spec.rb

require_relative 'rspec_around_context'

module RSpec
  module Core
    %i[ all context ].each do |scope|
      describe "around(:#{scope}) hook" do
        it "runs the hook around all examples" do
          order = []

          group = ExampleGroup.describe "group" do
            around(scope) do |g|
              order << :before
              g.run_examples
              order << :after
            end
            specify { order << :e1 }
            specify { order << :e2 }
          end

          group.run(double.as_null_object)
          expect(order).to eq([:before, :e1, :e2, :after])
        end

        it 'allows the yielded arg to be treated as a proc' do
          group = ExampleGroup.describe "group" do
            def self.order
              @order ||= []
            end

            def self.transactionally
              order << :before
              yield
              order << :after
            end

            around(scope) { |g| transactionally(&g) }
            specify { self.class.order << :e1 }
            specify { self.class.order << :e2 }
          end

          group.run(double.as_null_object)
          expect(group.order).to eq([:before, :e1, :e2, :after])
        end

        it 'can access metadata in the hook' do
          foo_value = nil
          group = ExampleGroup.describe "group", :foo => :bar do
            around(scope) do |group|
              foo_value = group.metadata[:foo]
              group.run_examples
            end
            specify { }
          end

          group.run(double.as_null_object)
          expect(foo_value).to eq(:bar)
        end

        it 'allows around(:each) hooks to run as normal' do
          order = []

          group = ExampleGroup.describe "group" do
            around(:each) do |e|
              order << :before
              e.run
              order << :after
            end
            specify { order << :e1 }
            specify { order << :e2 }
          end

          group.run(double.as_null_object)
          expect(order).to eq([:before, :e1, :after, :before, :e2, :after])
        end
      end
    end
  end
end