Log an internal note on the record with the "Log note" button of the chatter, and wait for the note to appear in the thread. A note stays internal: followers who are not internal users do not receive it.
Examples
When I log the note "Called the customer, waiting for the order"
When we log the note "Checked by the review"
And I log the note "Price confirmed"
When I log the internal note "Reminder sent"
And we log the internal note "Left a voice mail"
Pattern
When(/^(I |we )*log the (?:internal )?note "([^"]*)"$/, …)
Part of @webship-js/odoo-steps (github.com/webship/odoo-steps), a step pack for Webship-js 2.0.x.