Rspec command line test

Question

Currently a I am build has the following two lines which I want to create a unit test for:

system @command.join(' ')
exit $?.exitstatus

Now I know I can do something like this:

Kernel.should_receive(:system).with()
Kernel.should_receive(:exit).with(0)

However when gem calls $?.exitstatus I've been unable to mock/stub this.

Does anyone know how to do this??

Community · Accepted Answer · 2017-05-23 12:11:08Z

1

based on this

You should stub not Kernel, you should stub system from the current class.

for example

#user.rb
def self.my_test
  system('ls')
end

#test
User.should_receive(:system).and_return('aaa')
User.my_test # => 'aaa'

Do not forget to use stub for any_instance if it is called not in class scope

edited May 23, 2017 at 12:11

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answered Sep 19, 2013 at 13:55

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1 Comment

Jonathan Warykowski Over a year ago

Hi, Gave this ago and now it works as intended with the following, in my case anyhow: Cukesparse.should_receive(:system).with('test') Cukesparse.should_receive(:exit) Cheers, Jon

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