Spring@Value注入转换在@SpringJUnitConfig测试中不起作用

Question

在使用@SpringJUnitConfig测试时，我找不到在注入@Value时进行自动值转换的方法。

例如，对于给定的代码：

@SpringBootApplication
class DemoApplication
fun main(args: Array<String>) {
runApplication<DemoApplication>(*args)
}
@Component
class ValueConvertInjection(@Value("2ms") val duration : java.time.Duration) {
@PostConstruct
fun init() = println("Duration converted: $duration")
}

给定的测试将失败：

@SpringJUnitConfig(classes = [ValueConvertInjection::class])
class JUnitValueConvertInjectionTest {
@Autowired
lateinit var vi :ValueConvertInjection
@Test
fun test() = assert(vi.duration == Duration.ofMillis(2))

}

以下情况除外：

...
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'java.lang.String' to required type 'java.time.Duration'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'java.time.Duration': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:76)
... 85 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'java.lang.String' to required type 'java.time.Duration': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:262)
at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:73)
... 89 more

我找不到应该添加到上下文中的内容，所以任何Spring转换都将被注册和拾取。

Answer 1

Spring Boot使用转换服务初始化上下文，这正是您所需要的：

public class ConversionConfiguration {
@Bean
fun conversionService() = ApplicationConversionService.getSharedInstance()
}
@SpringJUnitConfig(classes = [
ValueConvertInjection::class,
ConversionConfguration::class
]) {
class JUnitValueConvertInjectionTest {
@Autowired
lateinit var vi: ValueConvertInjection
@Test
fun test() = assert(vi.duration == Duration.ofMillis(2))   
}

Answer 2

要使用duration类，可以尝试如下

@Component
@ConfigurationProperties(prefix="time")
class ValueConvertInjection {

Duration val = Duration.ofSeconds(60);
@PostConstruct
fun init() = println("Duration converted: $duration")
}

在src/test/resources中，创建application.yml

time:
val:
2ms