Left si against the deal as they feel that we have to change our foreign policies and it'll further help in US imperialism. They are not sure about what an imperialism means here but?...
In case of test India has to show the reasons..if reasons are acceptable by International community (members of NSG, IAEA and US Senate) ..then no sanctions...otherwise...no fuel supply(uranium)...the reason is no one can use other people property to make bombs (like we did in 1974 nuclear tests)...
"My point is haven't we already tested nukes once or twice in the past?"
Nuclear test are in four categories:
1) surface 2) water (never done by us) 3) underground (never done by us) 4) space(only US is capable of it)
To fine tune nuclears bombs we need 100's of test..but the most important thing is even if we have bomb we don't have the capability or system to use it except for the prithvi missiles(250 Km max)..
In nuclear field to get mastery you need a expertise of 30-40 yrs and we don't have even for a good 2 years. As compared to permanent members we are surely very weak in that manner.
