The 2nd Fatteh sub built by Iran is ready to go
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They started testing it in March of 2017 and it will likely officially join Iran's fleet after 2 years of testing which would be around March of 2019 especially after the incident with the 1st one so if a war starts it will be active and unless a war start there really is no reason for them to rush the test and training and improve on what they built
The 1st Fatteh Iran built started it's testing in 2013 but it had structural problems because it was built with less expensive alloys that couldn't meet the requirements that were expected
1st Fatteh
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And the reason the testing takes so long is because the 1st Fatteh they built wasn't made out of the same materials so your basically testing a completely new platform & 2 years of testing and training before the official launch date is fairly standard for a sub like that during peace time.