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The current retry framework in testutil/testprc.WaitForResult uses
a func() (bool, error) callback until it succeeds or times out.
It captures the last error and returns it.
if err := testutil.WaitForResult(t, func() (bool, error) {
if err := foo(); err != nil {
return false, err
}
...
return true, nil
}); err != nil {
t.Fatal(err)
}
This makes the test functions more complex than they need to be since
both the boolean and the error indicate a success or a failure.
The retry.Run framework uses a an approach similar to t.Run()
from the testing framework.
retry.Run(t, func(r *retry.R) {
if err := foo(); err != nil {
r.Fatal(err)
}
})
The behavior of the Run function is configurable so that different
timeouts can be used for different tests.