Inspection question

I am a GC but haven't been active since 1991 and did not do additions, only new construction.

I want to relocate the laundry in my home from the garage to an upstairs location. On one side of the house is a bathroom/kitchen/garage fixtures and the other side of the house are three bathrooms.

I will tie the new laundry to the 4" ABS line downstream from the three bathrooms. The question I have is testing. I know how to test a complete house but don't know what I need to do to isolate the new laundry fixture for testing.

Do I have to pull all of the fixtures and plug to test the new laundry or is there a tactic I can use to only isolate the connection to the 4" ABS line I will connect to.

My house is in San Jose, CA and they are very strict with the code.

you can put in a 'test tee' and then when you are done install a cap. use a balloon to plug the line to isolate it before it gets to the other fixtures. i am not a plumber, but have seen this done. here are some test balloons.
http://www.cherneind.com/
http://www.cherneind.com/Pneumatic/Test_Ball/

test tee:

Install a test tee, then use a screw in test ball/plug. After the test you can release the water without flooding the area.

Here in Santa Clara (a couple blocks from SJ), they seem quite happy with a test tee that allows as much testing of the new work as practical. Also, if I wasn't sure, I'd go to the permit center and ask to talk to an inspector and simply ask what was expected. Haven't been bitten by one yet.