测试读取外部 YML 文件的 Spring 配置属性不起作用

Question

我正在使用 Spring Boot 2.4.8，并且正在将读取自外部 YML 文件的信息读入 bean：

@Component
@ConfigurationProperties(prefix = "my.conf")
@PropertySource(value = "classpath:ext.yml", factory = YamlPropertySourceFactory.class)
public class MyExternalConfProp {
  private String property;
  
  public void setProperty(String property) {
    this.property = property;
  }

  public String getProperty() {
    return property;
  }
}

我定义了一个自定义工厂来读取外部 YML 文件，如文章@PropertySource with YAML Files in Spring Boot 中所述：

public class YamlPropertySourceFactory implements PropertySourceFactory {

    @Override
    public PropertySource<?> createPropertySource(String name, EncodedResource encodedResource) {
        YamlPropertiesFactoryBean factory = new YamlPropertiesFactoryBean();
        factory.setResources(encodedResource.getResource());

        Properties properties = factory.getObject();

        return new PropertiesPropertySource(
            Objects.requireNonNull(encodedResource.getResource().getFilename()),
            Objects.requireNonNull(properties));
    }

}

YML文件内容如下：

my.conf.property: yeyeye

问题是我找不到合适的 slice 来单独测试配置属性。事实上，下面的测试失败了：

@SpringBootTest(classes = {MyExternalConfProp.class})
class MyExternalConfPropTest {

  @Autowired
  private MyExternalConfProp confProp;

  @Test
  void externalConfigurationPropertyShouldBeLoadedIntoSpringContext() {
    assertThat(confProp).hasFieldOrPropertyWithValue("property", "yeyeye");
  }
}

正如我们所说，测试失败并显示以下消息：

java.lang.AssertionError: 
Expecting
  <in.rcard.externalconfprop.MyExternalConfProp@4cb40e3b>
to have a property or a field named <"property"> with value
  <"yeyeye">
but value was:
  <null>

然而，如果我不使用任何切片，则测试成功：

@SpringBootTest
class ExternalConfPropApplicationTests {

    @Autowired
    private MyExternalConfProp confProp;

    @Test
    void contextLoads() {
        assertThat(confProp).hasFieldOrPropertyWithValue("property", "yeyeye");
    }

}

我该如何解决这个问题？是否可以将一些 initializer 或类似的东西添加到 slice 以使测试成功？

Here你可以在 GitHub 上找到整个项目。

Answer 1

将@EnableConfigurationProperties 添加到您的测试或在您的测试上启动spring boot 应用程序将解决问题

@EnableConfigurationProperties
@SpringBootTest(classes = {MyExternalConfProp.class})
class MyExternalConfPropTest {

  @Autowired
  private MyExternalConfProp confProp;

  @Test
  void externalConfigurationPropertyShouldBeLoadedIntoSpringContext() {
    assertThat(confProp).hasFieldOrPropertyWithValue("property", "yeyeye");
  }
}

或

@SpringBootTest(classes = {YourSpringBootApplication.class})
class MyExternalConfPropTest {

  @Autowired
  private MyExternalConfProp confProp;

  @Test
  void externalConfigurationPropertyShouldBeLoadedIntoSpringContext() {
    assertThat(confProp).hasFieldOrPropertyWithValue("property", "yeyeye");
  }
}