AIDEGen: Add new test cases to common_util_unittest.py.

Bug: 137156541
Test: 1. Patch aosp/1094929.
      2. atest aidegen_unittests --host
         all test passed!

Change-Id: I0011d9fdcf2d4d8540673d3b9b369ae8b04bf63c
2 files changed