Add fail test case for public API
Change tests to use robolectric
Change tests to use robolectric
Merge commit '67f7bd19983b6f8b187dd80971c0f5a27a12c790' into add-fail-test
Delete unused tests replaced by robolectric
Delete duplications
Merge pull request #4 from studyplus/add-fail-test

公開APIのFailTestを追加