Expected behavior is that a multi-document properties file can be created with different sections separated by "#--- " characters, for each section applicable to a given active profile. This works as expected when using a file named application.properties and allowing Spring Boot to bootstrap the application normally.

However, if the default application properties file is overridden in a JUnit test class annotated with a test property source (e.g. @TestPropertySource(locations="classpath:test.properties")), Spring Boot ignores the active profiles and simply references the last value it finds for the property in the properties file.

I have created a sample Java project to demonstrate the issue here: https://github.com/peter-thomas-mgd/spring-multi-doc

The example shows how an identical properties file behaves differently when specified as a test property source called test.properties vs. when bootstrapped as the default application.properties.