Assert the path configured as the site's front page, as the Basic site settings form (/admin/config/system/site-information) holds it.
Examples
Then the front page path should be "/node"
And the front page path should be "/home"
Then the front page path should not be "/user/login"
And the front page path should be "/welcome"
Then the front page path should not be "/node"
Pattern
Then(/^the front page path should( not)* be "([^"]*)"$/, …)
Part of @webship-js/drupal-core-steps (github.com/webship/drupal-core-steps), a step pack for Webship-js 2.0.x.