Add a new test that checks if the support for test methods with multiple test resources specified via the @TestResources works

# Task Description

Create a new test and make sure it uses something like:
```java
@Test
@TestResources({ @TestResource(source = "classpath:/invoices/linkedin/*.pdf",
destinationDir = "Unprocessed/LinkedIn"),
@TestResource(source = "classpath*:invoices/upwork/*.pdf",
destinationDir = "Unprocessed/Upwork") })
```

and validate whether these resources are indeed copied. If they're not, then there is a bug which needs to be fixed.

# Open Questions

# Notes

# Task List

The following tasks will need to be carried out:
* [ ] Investigate the issue.
* [ ] Provide a solution.
* [ ] Test the fix.
* [ ] Update the documentation.

# Useful Commands

# Incurred Costs

# Task Relationships

This task:
* Is a sub-task of:
* Depends on:
* Is a follow-up of:
* Relates to:

# Resources

# Useful Links

# Points of Contact