[FEATURE] Write acceptance tests

[eliashaeussler]

Is your feature request related to a problem?

The core component of this exception, the modified exception handler, is currently not covered by any tests. Instead, only related components have a pretty good code coverage.

Describe the solution you'd like

In order to cover the exception handler as well, acceptance tests should be written. This is especially useful to test the provided middlewares.

Describe alternatives you've considered

Actually, functional tests would also be possible in this case. But it's probably easier to validate the functionality with acceptance tests as they are better to handle E2E test scenarios.

Additional context

No response

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