相关疑难解决方法(0)

我想对Spring-boot进行Junit测试,如下所示:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {ApplicationTest.class})
public class TestOnSpring {
    @Value("${app.name}")
    private String appName;

    @Test
    public void testValue(){
        System.out.println(appName);
    }
}

和ApplicationTest.java这样

@ComponentScan("org.nerve.jiepu")
@EnableAutoConfiguration()
public class ApplicationTest {

    public static void main(String[] args) {
        SpringApplication.run(ApplicationTest.class, args);
    }
}

我的POM是这样的:

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.0.BUILD-SNAPSHOT</version>
    </parent>

当我运行测试时,我得到了以下错误信息

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'app.name' in string value "${app.name}"
    at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174)
    at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126)
    at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:204)
    at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:178)
    at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:172)
    at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:807)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1027)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:543)
    ... 31 more

但是当我将此应用程序作为普通Java应用程序运行时

@SpringBootApplication
public …

这是一个Spring bean的片段:

@Component
public class Bean {

    @Value("${bean.timeout:60}")
    private Integer timeout;

    // ...
}

现在我想用JUnit测试来测试这个bean.因此我使用SpringJUnit4ClassRunner和ContextConfiguration注释.

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class BeanTest {

    @Autowired
    private Bean bean;

    // tests ...

    @Configuration
    public static class SpringConfiguration {
        @Bean
        public Bean bean() {
            return new Bean();
        }
    }
}

不幸的是,SpringJUnit4ClassRunner无法解析@Value表达式,即使提供了默认值(抛出NumberFormatException).似乎跑步者甚至无法解析表达式.

我的测试中缺少什么？

对于我的一个Spring bean(比如Application类),我使用@Value注释从属性文件(prop.properties)中获取属性的值(my.property.flag = true/false).这完全没问题.

我需要编写一个集成测试(比如说ApplicationIt类),我需要测试属性的值,即true和false.

在我的属性文件中,属性的值设置为true.是否可以从我的Integration测试中将值动态设置为false？

例如,

prop.properties:

    my.property.flag=true

应用程序类文件:

    @Component
    class Application {
        //This value is fetched from properties file
        //the value is set to true.
        @Value(${my.property.flag})
        private String isTrue;
        ......
        ..........
    }

整合测试:

    class ApplicationIT {
        //how can I set the value of isTrue here to false?
    }