[Android] Refactor tests

[Habib Kazemi]

vlc-android | branch: master | Habib Kazemi <kazemihabib1996 at gmail.com> | Mon Aug  6 15:52:11 2018 +0430| [7a12fc43f39a909673794ce55247f6bbae3d8aa0] | committer: Geoffrey Métais

Refactor tests

android.arch.core:core-testing dependency added so we have tools to test
arch components.
Utils that common between test and AndroidTest moved to
test-common.
Dao tests all extend DbTest so initDb and closeDb handled there.
Dao tests have new naming convention.

Signed-off-by: Geoffrey Métais <geoffrey.metais at gmail.com>

> https://code.videolan.org/videolan/vlc-android/commit/7a12fc43f39a909673794ce55247f6bbae3d8aa0
---

 .../org/videolan/vlc/database/BrowserFavDaoTest.kt | 135 ++++++++++++---------
 .../org/videolan/vlc/database/DbTest.kt            |  54 +++++++++
 .../videolan/vlc/database/ExternalSubDaoTest.kt    | 114 ++++++++---------
 .../org/videolan/vlc/database/SlaveDaoTest.kt      |  52 ++------
 vlc-android/build.gradle                           |   7 +-
 .../org/videolan/vlc/util/LiveDataTestUtil.kt      |   0
 .../java/org/videolan/vlc/util/TestUtil.kt         |  80 ++++++++++++
 7 files changed, 289 insertions(+), 153 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/7a12fc43f39a909673794ce55247f6bbae3d8aa0