Spring Boot测试时@PropertySource加载不到文件异常

项目启动时没有问题，但是测试时提示：

Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.acgist.main.ApiServiceOrderApplication]; nested exception is java.io.FileNotFoundException: Could not open ServletContext resource [/c3p0.properties]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:184)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:316)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:233)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:271)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:91)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:139)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
	... 25 common frames omitted
Caused by: java.io.FileNotFoundException: Could not open ServletContext resource [/c3p0.properties]
	at org.springframework.web.context.support.ServletContextResource.getInputStream(ServletContextResource.java:159)
	at org.springframework.core.io.support.EncodedResource.getInputStream(EncodedResource.java:159)
	at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:99)
	at org.springframework.core.io.support.PropertiesLoaderUtils.fillProperties(PropertiesLoaderUtils.java:73)
	at org.springframework.core.io.support.PropertiesLoaderUtils.loadProperties(PropertiesLoaderUtils.java:59)
	at org.springframework.core.io.support.ResourcePropertySource.<init>(ResourcePropertySource.java:67)
	at org.springframework.core.io.support.DefaultPropertySourceFactory.createPropertySource(DefaultPropertySourceFactory.java:37)
	at org.springframework.context.annotation.ConfigurationClassParser.processPropertySource(ConfigurationClassParser.java:453)
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:272)
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:194)
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:296)
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:202)
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:170)
	... 37 common frames omitted

测试注解部分代码：

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ApiServiceOrderApplication.class)

这个是为什么呢，最后我发现原来是配置的注解有问题：

@Configuration
@PropertySource(value = "/c3p0.properties")
// 添加classpath:
@Configuration
@PropertySource(value = "classpath:/c3p0.properties")

这样测试就能正常加载了。