RSpec check the count of an array
Solution 1
Try
expect(assigns(:products)).to_not be_empty
This works because the array responds to empty?
. Another way could be
expect(assigns(:products).count).to be_positive
Because integers respond to positive?
While if you wanted to check an actual count
expect(assigns(:products).count).to eq 1
Solution 2
You could also turn it around a bit into the following:
expect(assigns(:products)).to have_attributes(count: be_positive)
This allows you to use subject
, like this for example:
subject { assigns(:products) }
it { is_expected.to have_attributes(count: be_positive) }
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Darkisa
Just a guy who likes to learn and who likes to help people learn
Updated on September 14, 2022Comments
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Darkisa about 1 year
I am testing my controller action for practice. In my controller, I just want to get all the distinct products by name from my database:
def shop @products = Product.select('distinct on (name) *').sort_by &:order end
I've checked this manually and it works fine. Now I am setting up my test using my RSpec and I want to test that @products is an array greater than 0:
RSpec.describe PagesController, type: :controller do describe 'GET #shop' do it 'should get all proudcts' do get :shop expect(assigns(:products).count).to be > 0 end end end
Now, I've tried several different combinations of the expect... but it keeps telling me that its either nil or 0, which I know it's not. How can I test that an array is greater 0?
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Daniel Westendorf almost 6 yearsAlternatively to these options, you can create your own matcher. Here is an example. gist.github.com/danielwestendorf/…
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Darkisa almost 6 yearsThanks Ursus. I actually found the problem. I didn't seed my test database with data so I had it right, just didn't set everything up right. smh.
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akostadinov almost 2 yearsbetter answer, because array/object content is shown in exception using this approach