Before I started my test, these are the conditions:
1. Friendly to Federation
2. Neutal to Empire and Alliance
3. Start location is Sol
4. ALLIED with all minor factions in Sol.
5. In SOLO mode - did not want players to muck up my tests
Since I wanted to test hosilities, I deliberately picked an Empire power to pledge to.. and who better than that hot chick Aisling?
After pledging, I noticed the word "HOSTILE" on my dashboard, where the usual "Speeding" and "WANTED" labels are. So now I'm supposedly in hostile space, in Sol.
I launched from Abraham Lincoln, and all ships are still GREEN to me. I saw a couple of neutral ships, they were supporting some other people (Edward and Archon something). They ignored me, I ignored them. Nothing happened.
I jumped into SC, headed for Titan. Primarily I just wanted to fly around and see what the reaction was. I got interdicted twice - once by "Federal Agents" belonging to that Archon guy (which I promptly dispatched and earned 600 cr for all 3 of them), and the 2nd time was by a Sol authority system vessel.. the cops. Interesting since I'm CLEAN and cops normally don't interdict "clean" players. So I dropped out and let him scan me. He's GREEN to me. After that he just jumped out with no shots fired.
Incidentally that was when I learnt Sol was under the control of Hudson. Maybe that's why I got interdicted by the cops (different PP faction) but no shots fired (ALLIED Federal Congress).
Step 2 test - jump to another Federation system where I am not ALLIED with the minor factions. So I did, to EZ Aquarii. Ships still GREEN to me, cuz I am "friendly" with Federation. No interdictions happened.
Step 3 - Empire system test. I picked ZELAND because it's under control of Patreus, directly opposing Aisling (the one I pledged support to). Jumped in, no "HOSTILE" tag. Interesting. All ships neutral, could see a couple of GREEN ships cuz they were traders from Federation. No interdictions all the way in to the station.
Step 4 - Alliance system test. I picked LAVE (good old Lave!). Nothing happened on the way to Lave. After arriving at Lave, about 50% ships were GREEN to me. Ah, probably due to being friendly for trading rares in the past. "HOSTILE" tag appeared. No interdictions all the way to Lave station.