Use different file path for testing in Spring Boot - spring-boot

Question

I have a class in my project housing a method to retrieve files (as a list). In order to write unit tests, and to be able to put everything into a versioning tool, I want put a small example directory into my project. However, when I do that, my method needs to be able to distinguish whether or not it should read from the real (project-external) path or the testing environment.
This is my method:
fun getDirectoryContentObject(baseUserDir: String): UserLicenses {
val dirExists = Files.exists(Paths.get(licenseLocation + baseUserDir))
if(!dirExists) {
return UserLicenses(baseUserDir, listOf())
}
val userLicenses = UserLicenses(baseUserDir, listOf())
Files.walk(Paths.get(licenseLocation + baseUserDir)).forEach { outerIt ->
val dirOrFileName = outerIt.fileName.toString()
if (dirOrFileName != baseUserDir && !dirOrFileName.endsWith(licenseFileExtension)) {
val fileList: MutableList<String> = mutableListOf()
Files.walk(Paths.get(outerIt.toString())).forEach { innerIt ->
val subDirOrFileName = innerIt.fileName.toString()
if (subDirOrFileName.endsWith(licenseFileExtension)) {
fileList += subDirOrFileName
}
}
userLicenses.licenseVersions += LicenseVersions(dirOrFileName, fileList)
}
}
return userLicenses
}
The licenseLocation value is set by #Value from application.yml and point to the files outside the project.
How can I tell the method to get the files from the inside the project if it is being executed by a unit test?

Answer 1

You can use spring resource api to get file instance.
https://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/util/ResourceUtils.html
External Example:
filepath: file:/some-os-path/some-file-somewhere.abc
ResourceUtils.getFile(filepath);
Test Example:
filepath: classpath:file-from-resources-folder.abc
ResourceUtils.getFile(filepath);