RSpec::Files

Detect leaked file descriptors and provides convenient file buffers.

Add this line to your application's Gemfile:

gem 'rspec-files'

And then execute:

$ bundle

Or install it yourself as:

$ gem install rspec-files

Finally, add this require statement to the top of spec/spec_helper.rb

require 'rspec/files'

Leaking sockets and other kinds of IOs are a problem for long running services. RSpec::Files::Leaks tracks all open sockets both before and after the spec. If any are left open, a RuntimeError is raised and the spec fails.

RSpec.describe "leaky ios" do
	include_context RSpec::Files::Leaks
	
	# The following fails:
	it "leaks io" do
		@input, @output = IO.pipe
	end
end

In some cases, the Ruby garbage collector will close IOs. In the above case, it's possible that just writing IO.pipe will not leak as Ruby will garbage collect the resulting IOs immediately. It's still incorrect to not close IOs, so don't depend on this behaviour.

File buffers are useful for specs which implement I/O operations. This context automatically manages a disk-based file which can be used for buffering.

RSpec.describe "buffer" do
	include_context RSpec::Files::Buffer
	
	it "can read and write data" do
		buffer.write("Hello World")
		buffer.seek(0)
		
		expect(buffer.read).to be == "Hello World"
	end
end

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request