[Android] Done PlaylistsViewModelTest

[Shivansh Saini]

vlc-android | branch: master | Shivansh Saini <shivanshs9 at gmail.com> | Fri Jul 12 06:48:29 2019 +0530| [ccdfd67f528d137bf2d46abf16751c99a398b455] | committer: Geoffrey Métais

Done PlaylistsViewModelTest

> https://code.videolan.org/videolan/vlc-android/commit/ccdfd67f528d137bf2d46abf16751c99a398b455
---

 .../medialibrary/stubs/StubDataSource.java         |   8 +
 .../vlc/viewmodels/mobile/FoldersViewModelTest.kt  |  52 ------
 .../vlc/viewmodels/mobile/PlaylistViewModelTest.kt |  26 +++
 .../viewmodels/mobile/PlaylistsViewModelTest.kt    | 187 +++++++++++++++++++++
 4 files changed, 221 insertions(+), 52 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/ccdfd67f528d137bf2d46abf16751c99a398b455