tree 10b44217fdadce5d563a47a9e519d82f8438fbd4
parent f77189f7e4eb5fe6d489cde6539f07346539254f
author Lei YU <mine260309@gmail.com> 1565337250 +0800
committer Lei YU <mine260309@gmail.com> 1566182952 +0800

Test: Add unit test for PSU plug out and in

Split the function into two, one for handling the sdbus::message, the
other for handling the changed properties, so that it's easier to write
unit test cases.

Added the test cases:
* On a system with a PSU present, remove the PSU;
* On a system without PSU, plug the PSU in;
* On a system with a PSU, remove the PSU and add it back, while the
  propertiesChanged callback is invoked with both Present and Version
  properties.
* On a system with two PSUs with same version, remove them one-by-one,
  and add back one-by-one, while PSU1 has a different version.

Tested: Verify ItemUpdater correctly handles the above cases:
        * Remove the activation and version object if PSU is removed;
        * Create activation and version object if PSU is added;
        * When there are two PSUs with same version, removing one only
          update the associations, removing the other shall result in
          the objects to be removed;
          Adding one back will create the objects, and adding the other
          one with different version will create new objects.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I14c7ae9f03ec91bb1c85bb5a18d69f20dc1efd53