Assessments
Before you recruit or promote an internal staff, you need to ensure that the potential candidates have the right competencies to  step into the new position. Many manager experienced disappointments after the new manager start at the new role.

Avoid this scenarios and use assessments to gauge their personality and de-railers with ongoing coaching to ensure the newly appointed candidate will be able to groove in.
 
Feedbacks
What do your manager, peers, subordinates and internal customers perceive of you? Your daily behaviour is a good gauge of what personality you are displaying in the workplace. 360 feedbacks are often used to confirm the self assessments of the manager. Coaches uses 360 to shadow their candidates to development in their leadership role. 

Assessments

There are many assessments available in the Talent Development market. Depending on your intended measurements, there Hogans, MRG, TalentQ, Extended DISC, MBTI and many others

360 Feedbacks

There are off-the-shelf 360 feedback platforms available but most companies would like their customise to their competencies. Most provide similar data to facilitate coaching.
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Coaching

Almost every managers would need coaching to expedite their climb up the corporate ladder.  Coaches provide hand-holding and guidance as the candidates manoeuvre their leadership journey.