From type/Test

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multi sub ok(Mu $cond, $desc = '')

The ok function marks a test as passed if the given $cond evaluates to True. It also accepts an optional description of the test as second argument.

my $response; my $query; ...;
ok $response.success, 'HTTP response was successful';

In principle, you could use ok for every kind of comparison test, by including the comparison in the expression passed to $cond:

sub factorial($x) { ... };
ok factorial(6) == 720, 'Factorial - small integer';

However, where possible it's better to use one of the specialized comparison test functions below, because they can print more helpful diagnostics output in case the comparison fails.