Jake Benilov wrote:
Hello Ben,
Hi Jake,
I hope you don't mind but I am copying this response to the rspec-users
list in case any one else is able to shed more light on it.
I have a bit of a newbie question regarding fakefs; I want to test Rake
tasks using fakefs and rspec:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
require 'fakefs/safe'
require 'rake'
require 'spec'
task :create_file do
touch "/abc"
end
describe "my rake script" do
before do
FakeFS.activate!
end
it "should create a file abc" do
Rake::Task[:create_file].invoke
File.should exist("/abc")
end
after do
FakeFS::FileSystem.clear
FakeFS.deactivate!
end
end
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When I run this, a real file /abc is being created on the filesystem. I
am guessing that this has to do with the fact that the touch method
isn't FileUtils.touch, but rather that FileUtils is being included into
Rake and thus touch is not being mocked out.
Is my analysis correct? In any case, is there a way that you can think
of to write such a spec?
I've never tested a Rake task with FakeFS before so I looked into a
bit. In short, I think your analysis is correct. However, it is a bit
confusing because Rake does in fact use FileUtils::touch. I discovered
that when you fully qualify FileUtils::touch in the rake task then it
works fine. I stepped into rake's call to 'touch' and it seems to be
doing some other logic specific to rake. My hunch is that rake somehow
retains a handle onto the original FileUtils const even though it is
replaced by the fake ones with FakeFS. I'm not familiar with Rake's
code base so I can't say that for sure or how to really fix it.
However, you can fully qualify the call if you want to but that will be
going around some rake logic and may have some undesired effects (I
can't think of what though). I'm sure someone more familiar with Rake's
code could offer a better solution. Here is a gist of my explorations
in case anyone else wants to play around with it:
http://gist.github.com/223989
HTH,
Ben
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