CreateTmpDir creates a temporary directory.

NewPebble creates a new Pebble instance by reading the necessary configuration settings from environment variables or using defaults.

Retry retries op at most n times before it fails t.

SetLegoCACertificates sets the LEGO_CA_CERTIFICATES environment variable to certPath.

SkipIfPebbleDisabled checks whether the test should be skipped because pebble is not available.

FlagUpdate signals that the tests should update their golden files.

Pebble represents an instance of the pebble test server used for testing ACME protocol clients.