@Override
    public File getFile(File directory, String metricName) {
        return new File(directory, sanitize(metricName) + ".csv");
    }
@Test
    public void testGetFileSanitize() {
        FixedNameCsvFileProvider provider = new FixedNameCsvFileProvider();
        File file = provider.getFile(dataDirectory, "/myfake/uri");
        assertThat(file.getParentFile()).isEqualTo(dataDirectory);
        assertThat(file.getName()).isEqualTo("myfake.uri.csv");
    }