First of all, if your friend has been working, he may be entitled to Jobseeker's Benefit for 12 months - that's not means tested at all. If he's still unemployed after 12 months, he is then assessed for jobseeker's allowance which is means tested.
All savings and investments are counted as means - for jobseeker's allowance, the first 20000 of savings is disregarded. After that, there's a sliding scale of how it's assessed.
Depending on how much your friend has, there may be little or no means assessed against him.