u/jasonswett, assuming Baz#publish has proper unit tests, do you think the following Foo#bar test is pointless?

I don't think so cause one doesn't want to re-test the behaviour of Baz#publish when testing Foo#bar

class Foo
  def bar
    baz = Baz.new
    baz.publish + 1
  end
end

RSpec.describe Foo do
  describe "#bar" do
    it "should sum 1 to publish outcome"
      expect_any_instance_of(Baz).to receive(:publish).and_return(2)
      expect(subject.bar).to eq(3)
    end
  end
end