When I open the "Blog" source of the index

Open a source of the index: an item of its sidebar, such as a section, a category group or a volume.

Examples

When I open the "Blog" source of the index
When I open the "All entries" source of the index
When we open the "Images" source of the index
And I open the "Editors" source of the index
When I open the "Pages" source of the index

Pattern

When(/^(I |we )*open the "([^"]*)" source of the index$/, …)

Part of @webship-js/craft-cms-steps (github.com/webship/craft-cms-steps), a step pack for Webship-js 2.0.x.