This tile is intended to purposefully mark a run as failed if certain conditions are not met with the data. A list of scalar boolean values can be listed after the with keyword.
a = 30
b = 50
show assert "My flags" with
(a > 20) as "a is not greater than 20"
(1 + b < 50) as "1+b is not lesser than 50" // FAIL!
The text value provided after the as keyword is passed to the error message.