The `change` matcher requires a block to execute so it can evaluate before /
after, but the one liner syntax doesn’t support that, so you need to use the
third form, to improve readability here you could use the named subject,
`subject(:index) { get :index }` and thus `expect { index }.to change {
assigns(:assets) }.from(nil)`
Jon Rowe
---------------------------
[email protected]
jonrowe.co.uk
On Wednesday, 11 March 2015 at 13:45, Greg Lappen wrote:
> Hi all, long time-user here, but first time poster... I've been a fan of
> rspec for about 6 years now.
>
> Anyway, I'm writing because I'm making some specs and trying to use the
> one-liner syntax to keep it brief. It works, except for when I try to use it
> with the change matcher. It's a simple controller spec I'm doing:
>
> describe "GET #index" do
> subject { get :index }
>
> it { should be_success }
>
> # attempt 1
> it { is_expected.to change{assigns(:assets)}.from(nil) }
>
> # attempt 2
> it { should change{assigns(:assets)}.from(nil) }
>
> # attempt 3
> it "should assign @asset" do
> expect{subject}.to change {assigns(:assets)}.from(nil)
> end
> end
>
>
> Both attempt 1 and 2 above fail with the message "expected result to have
> changed from nil, but was not given a block". Attempt 3 succeeds.
>
> Can anyone explain what's going on here?
>
> Thanks so much!
>
> Greg
>
>
>
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