使用 Testcontainers 进行 Dropwizard 集成测试答案

【问题标题】：Dropwizard integration testing with Testcontainers使用 Testcontainers 进行 Dropwizard 集成测试
【发布时间】：2017-12-19 04:09:08
【问题描述】：

我正在尝试针对 dockered 数据库运行 dropwizard 的集成测试。

我尝试过的：

@ClassRule
public static final PostgreSQLContainer postgres = new PostgreSQLContainer();

@ClassRule
    public final DropwizardAppRule<Configuration> RULE = new DropwizardAppRule<>(
            Application.class,
            CONFIG_PATH,
            ConfigOverride.config("dataSourceFactory.url", postgres.getJdbcUrl()),
            ConfigOverride.config("dataSourceFactory.user", postgres.getUsername()),
            ConfigOverride.config("dataSourceFactory.password", postgres.getPassword())
    );

我收到Caused by: java.lang.IllegalStateException: Mapped port can only be obtained after the container is started

将这些链接在一起也不起作用

@ClassRule
    public static TestRule chain = RuleChain.outerRule(postgres = new PostgreSQLContainer())
            .around(RULE = new DropwizardAppRule<>(
                    Application.class,
                    CONFIG_PATH,
                    ConfigOverride.config("dataSourceFactory.url", postgres.getJdbcUrl()),
                    ConfigOverride.config("dataSourceFactory.user", postgres.getUsername()),
                    ConfigOverride.config("dataSourceFactory.password", postgres.getPassword())
            ));

终于可以了，但据我了解，它为每个测试运行新的 DropwizardAppRule，这不好...

@ClassRule
public static final PostgreSQLContainer postgres = new PostgreSQLContainer();

@Rule
    public final DropwizardAppRule<Configuration> RULE = new DropwizardAppRule<>(
            Application.class,
            CONFIG_PATH,
            ConfigOverride.config("dataSourceFactory.url", postgres.getJdbcUrl()),
            ConfigOverride.config("dataSourceFactory.user", postgres.getUsername()),
            ConfigOverride.config("dataSourceFactory.password", postgres.getPassword())
    );

那么我怎样才能在创建 DropwizardAppRule 之前链接规则，以便首先启动 PostgreSQLContainer 并启动容器？

【问题讨论】：

标签： dropwizard testcontainers

【解决方案1】：

通过将 PostgreSQL Container 作为单例启动来使其工作。

    public static final PostgreSQLContainer postgres = new PostgreSQLContainer();
    static {
        postgres.start();
    }

    @ClassRule
    public final DropwizardAppRule<Configuration> RULE = new DropwizardAppRule<>(
            Application.class,
            CONFIG_PATH,
            ConfigOverride.config("dataSourceFactory.url", postgres.getJdbcUrl()),
            ConfigOverride.config("dataSourceFactory.user", postgres.getUsername()),
            ConfigOverride.config("dataSourceFactory.password", postgres.getPassword())
    );

【讨论】：