Assert the text of the single configuration export contains (or does not contain) a text.
Examples
Then the exported configuration should contain "site_name"
Then the exported configuration should contain "\"_config_name\": \"system.core\""
And the exported configuration should not contain "password"
Then the exported configuration should contain "main-menu"
And the exported configuration should not contain "no-such-key"
Pattern
Then(/^the exported configuration should( not)* contain "(.*)"$/, …)
Part of @webship-js/backdrop-cms-steps (github.com/webship/backdrop-cms-steps), a step pack for Webship-js 2.0.x.