Then I should see no system messages

Assert the page shows no system message at all (or, with "not", at least one), whatever its type.

Examples

Then I should see no system messages
Then we should see no system messages
And I should see no system messages
Then should see no system messages
And we should see no system messages

Pattern

Then(/^(I |we )*should see no system messages$/, …)

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