Leak test refernce

Can any one tell me about the reference regarding Leak test.

Leak Test depends on the Sealing nature of the pack (it means the No. of samples taken shall be derived from the No. of packs being generated while 1 sealing/ capping round) and it is used to check integrity of the packed blister, jars, bottles etc.

Reference can be taken from Supplier documents to desing your inhouse document with respect to Vacuum or timer etc…