@Deprecated
    public String idFromFilename(@NonNull String filename) {
        return filename;
    }
@SuppressWarnings("deprecation")
    @Test
    public void caseSensitivePassesThroughOldLegacy() {
        IdStrategy idStrategy = new IdStrategy.CaseSensitive();

        assertThat(idStrategy.idFromFilename("make\u1000000"), is("make\u1000000"));
        assertThat(idStrategy.idFromFilename("\u306f\u56fd\u5185\u3067\u6700\u5927"), is("\u306f\u56fd\u5185\u3067\u6700\u5927"));
        assertThat(idStrategy.idFromFilename("~1fred"), is("~1fred"));
    }