spring-boot-demo/redis/src/test/java/com/ankurm/redis/RedisCacheDefaultTest.java

package com.ankurm.redis;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.catchThrowable;

import java.util.List;

import com.ankurm.redis.cache.UserService;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.CacheManager;
import org.springframework.core.NestedExceptionUtils;
import org.springframework.test.context.TestPropertySource;

/**
 * Redis as the Spring cache, with Boot's defaults. Writes docs/output/14-cache-default.txt.
 */
@RedisTest
@TestPropertySource(properties = "spring.cache.redis.time-to-live=10m")
class RedisCacheDefaultTest {

    @Autowired
    CacheManager cacheManager;

    @Autowired
    UserService users;

    @BeforeEach
    void clean() {
        LocalRedis.flush();
        users.resetCalls();
    }

    @Test
    void defaultsUseJdkSerialisationForValues() {
        try (Transcript t = new Transcript("14-cache-default.txt",
                "Redis as the Spring cache: what the defaults store")) {

            t.section("Which cache manager did Boot pick?");
            t.line("%s", cacheManager.getClass().getName());

            t.section("A Serializable result, cached");
            users.findSerializable(1);
            users.findSerializable(1);
            t.line("findSerializable(1) called twice, method body ran %d time(s)", users.calls());
            assertThat(users.calls()).isEqualTo(1);
            t.cliSorted("KEYS", "*");
            List<String> ttl = t.cli("--no-raw", "TTL", "legacy::1");
            assertThat(ttl.get(0)).isEqualTo("(integer) 600");
            t.cli("--no-raw", "GET", "legacy::1");

            t.section("A result that is not Serializable");
            t.line("users.find(1)");
            Throwable thrown = catchThrowable(() -> users.find(1));
            assertThat(thrown).isNotNull();
            t.line("%s", thrown.getClass().getName());
            t.line("  message: %s", thrown.getMessage());
            Throwable root = NestedExceptionUtils.getMostSpecificCause(thrown);
            t.line("  root:    %s", root.getMessage());
            t.line("method body ran %d time(s) in total", users.calls());
            t.cliSorted("KEYS", "*");
        }
    }
}