@Test
public void testExtractSessionId() {

  assertEquals("", RedisSessionRepository.extractSessionId(""));
  assertEquals("123123", RedisSessionRepository.extractSessionId("123123"));
  assertEquals("123123", RedisSessionRepository.extractSessionId("abc:123123"));
  assertEquals("123123", RedisSessionRepository.extractSessionId("abc:{123123}"));
  assertEquals("0123123", RedisSessionRepository.extractSessionId("abc:0{123123}"));
  assertEquals("0123123", RedisSessionRepository.extractSessionId("abc:def:0{123123}"));
  assertEquals("{123123", RedisSessionRepository.extractSessionId("abc:{123123"));
}