@Override
    public ConfigData get(String path) {
        return get(path, null);
    }
@Test
    public void testGetOneKeyWithEmptyPath() {
        ConfigData config = envVarConfigProvider.get("", Collections.singleton("test_var1"));
        Map<String, String> data = config.data();

        assertEquals(1, data.size());
        assertEquals("value1", data.get("test_var1"));
    }