@Override
    public ConfigData get(String path) {
        return get(path, Files::isRegularFile);
    }
@Test
    public void testGetAllKeysAtPath() {
        ConfigData configData = provider.get(dir);
        assertEquals(toSet(asList(foo, bar)), configData.data().keySet());
        assertEquals("FOO", configData.data().get(foo));
        assertEquals("BAR", configData.data().get(bar));
        assertNull(configData.ttl());
    }