List of tests to ensure the module's functionality

Problem/Motivation

We currently have some basic general and manifest related tests. But further tests should be added.

This issue is dedicated to relevant tests which couldn't get added right away with the feature requests, because of missing resources.

• ✨ Add test to check manifest.json against JSON Schema Active
• Add tests app icons (related to 🐛 Defined App Image Icon isn't used Fixed

Steps to reproduce

Proposed resolution

Create the listed tests.

Remaining tasks

User interface changes

API changes

Data model changes