SU-GCM,
For decompression testing etc., a lot of the relevant paperwork is held by companies such as Jeppesen....might be worth a chat, and see what you can glean from them....I know that Stork Garwood labs. (USA) have done the decompression testing for various models of iPad that have come on to the market, and their testing is almost an industry standard it seems. Apple (in the case of the iPad) have various Li-ion standards the conform to with the iPad battery, and again, a hunt round their website will reveal the conformity standards they/the iPad meets.
For HMI and EMI considerations, depending on what process your looking to use to implement EFB, you will need to come up with an initial risk analysis covering these areas (amongst others), and there should be some advice/help available from the aircraft manufacturer, software developer (if specifically developed for aviation) etc. - actual testing as part of a Trial Evaluation Period will also help with feedback to prove various areas, but the whole process is dependent on many areas to be covered.....as mentioned earlier, in EASA land, the AMC 20-25 draft that was published as part of CRD 2012-02 should help clarify certain areas to be dealt with.....link below;
http://www.easa.europa.eu/rulemaking...%202012-02.pdf
regarding manuals, well they could be part of your OMA/OMB (SOP's)/OMD, or a separate set of manuals depending on your approach.....
Hope some of that is of help, and is my personal spin on things ;-)
F/o