Testing is not only a method to measure the level of skills. It also improves learning outcomes. This is why it makes sense to benefit from it even when there is no need to measure the achievement of a specific skill level. Testing and exercises can be embedded into a learning process in various different ways.
Regular self-assessment improves skills for objective self-evaluation and accepting criticism. Adopting the habit of self-assessment may help to enforce growth mindset and learning culture.
What kind of self-evaluation tasks you could give to yourself to be delivered regularly?
How could you help your team members to test their skills regularly?