void () { String newS = "tmp"; assertThat(FileUtil.sanitizeFileName(newS)).isSameAs(newS); assertThat(FileUtil.sanitizeFileName("_test")).isSameAs("_test"); assertThat(FileUtil.sanitizeFileName(" ")).isEqualTo("_"); assertThat(FileUtil.sanitizeFileName("\u2026")).isEmpty(); assertThat(FileUtil.sanitizeFileName("q_test")).isSameAs("q_test"); assertThat(FileUtil.sanitizeFileName("12_")).isSameAs("12_"); assertThat(FileUtil.sanitizeFileName("12_ 123")).isEqualTo("12___123"); assertThat(FileUtil.sanitizeFileName(" 12\u2026123")).isEqualTo("_12123"); assertThat(FileUtil.sanitizeFileName("a+b+c")).isEqualTo("a_b_c"); }