spring test: 配置文件优先级

application.properties 默认

application-xxx.properties 高

systemEnvironment 高

test/main/resources/ 同名文件 ？

@TestPropertySource 优先级最高 

Environment的属性配置都是在MutablePropertySources中，可以往里面增加自己的PropertySource

 

 add的时候会删除之前相同的propertySource, 因此可以重复增加，后面加载的会覆盖前面的

https://docs.spring.io/spring-boot/docs/1.5.9.RELEASE/reference/htmlsingle/#using-boot-configuration-classes

https://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#boot-features-external-config-application-property-files
https://stackoverflow.com/questions/29669393/override-default-spring-boot-application-properties-settings-in-junit-test
https://www.baeldung.com/properties-with-spring#boot

@RunWith解释：   https://github.com/junit-team/junit4/wiki/test-runners#runwith-annotation