commit 9c1f27227f843f10a2d286ded886464b60854e08
author Enrico Granata <egranata@google.com> Thu Sep 21 17:19:04 2017 -0700
committer Enrico Granata <egranata@google.com> Fri Sep 22 16:29:38 2017 -0700
tree 7b037678cd67afb7f7bea78d35180dd4faf3fe13
parent 414c5a39003f3b6fd64b5470e03605976a73b2c6

Tweaks to enhance testability

1) Add two entry points to SystemInterface:
   - getFilesDir(): returns a directory where permanent data can be stored (by default Context.getFilesDir())
                    This allows components under test to store data without affecting the real version of the files
   - getCurrentUptime(): returns the length of time that the system has been running (by default via SystemClock)
                         This is useful to enable testing of time-sensitive components

2) Add a TemporaryDirectory helper with the same semantics as TemporaryFile.
   Move both TemporaryFile and TemporaryDirectory to their own package in order to share between carservice_test and carservice_unit_test

Bug: 32512551
Test: runtest -x packages/services/Car/tests/carservice_unit_test
      runtest -x packages/services/Car/tests/carservice_unit_test/src/com/android/car/CarPowerManagementServiceTest.java
      runtest -x packages/services/Car/tests/carservice_test/src/com/android/car/CarStorageMonitoringTest.java

Change-Id: I31480cbd6b66df83804cc331d8c25a1403f10fe7