HomeFolder { public static String getFilePathInHomeFolder(final String fileName) { return String.format("%s%s", getHomeFolder(), fileName); } private  HomeFolder(); static String getFilePathInHomeFolder(final String fileName); static void createHomeFolderIfNotExisted();  }
@Test public void assertGetFilePathInHomeFolder() { assertThat(HomeFolder.getFilePathInHomeFolder("test_file"), is(HOME_FOLDER + "test_file")); }