How can I run only one test from a suite?

You simply append a colon and the function name, like this:

codecept run tests/acceptance/VisitorCest.php:myTestName

or a shorter version:

codecept run acceptance VisitorCest:myTestName

(Notice the space between the suite-name and the file-name.)

this is what works:

codecept run {suite-name} {file-name}.php:{function-name}

notice the space between the suite-name and the file-name

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