FileAccessService { public boolean isOwner(String userId, File file) { return file.getOwnerId().equals(userId); }  boolean isUserHasNotAccess(String userId, File file); boolean isUserCanNotDelete(String userId, File file); boolean isUserCanNotShare(String userId, File file); boolean isUserHasAccess(String userId, File file); boolean isUserCanDelete(String userId, File file); boolean isUserCanShare(String userId, File file); boolean isOwner(String userId, File file); boolean isUserHasAtLeastGivenPermission(String userId, File file, Permission... permissions);  }
@Test public void testIsOwner() throws Exception { }