Improved ListPatcherTest

Change-Id: Ie4be97512dd2831ffd5d88f7da5e859fcc5ac37c
Add unhappy path test to CallbackListDifferTest

Change-Id: Ifb2ea1f2f15febac9e879896e2dbeb4fafed7a01
Add unhappy path test to MapDifferTest

Change-Id: Iba9b99b71852a4758a8fce7756cb0c2ef5da50c7
Add unhappy path test to DiffTest

Change-Id: I31abcd1a5273ce8b600a1bb33130924c4653f9c6
Merge "Add unhappy path test to MapDifferTest"
Merge "Add unhappy path test to CallbackListDifferTest"
Merge "Improved ListPatcherTest"