Assert that the index offers, or does not offer, a source: an account only sees the sections, groups and volumes it may view.
Examples
Then I should see the "Blog" source in the index
Then I should not see the "Pages" source in the index
Then we should see the "Images" source in the index
And I should not see the "Notes" source in the index
Then we should not see the "Singles" source in the index
Pattern
Then(/^(I |we )*should( not)* see the "([^"]*)" source in the index$/, …)
Part of @webship-js/craft-cms-steps (github.com/webship/craft-cms-steps), a step pack for Webship-js 2.0.x.