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Add function to test engine to test with pre-set osnoise options, and use it to test whether osnoise period (as an example) is set correctly. The test works by pre-setting a high period of 10 minutes and stop on threshold. Thus, it is easy to check whether rtla is properly resetting the period to default: if it is, the test will complete on time, since the first sample will overflow the threshold. If not, it will time out. Cc: Luis Goncalves <lgoncalv@redhat.com> Link: https://lore.kernel.org/20250320092500.101385-7-tglozar@redhat.com Signed-off-by: Tomas Glozar <tglozar@redhat.com> Reviewed-by: John Kacur <jkacur@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>