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