Question

I’ve got something like this :

class Something
  def some_method
    %x{xyz}
  end
end

And in the spec :

describe Something do
  describe "#some_method" do
    it "should execute xyz command in a subshell" do
      x = Something.new
      #What should come here?
      x.some_method
    end
  end
end

I know how I can mock “system” . But my question is specific to “%x” . So how to mock %x ?

Answer 1

The line you are looking for is

x.should_receive(:`).once.with('xyz')

the backticks are actually a method being called and whatever is put between them is passed as a String argument. %x{...} is just a syntax variation to the backticks and thus cause the same method invocation.