In the UK, it is becoming common to require tests for all professions. I think this is a result of people ‘blagging’ on CVs (‘resumes’) and downright inventing experience they simply don’t have.
The only way for an employer to differentiate between candidates is to apply practical tests.
That said, I have also noticed an inverse relationship between the length of the interview process and the seniority of the position. Hiring a VP? A 30 chat and lets lunch. Taking on an intern? 2 days of interviews (with a panel), team-building ‘initiative tests’ and written exams. In case you think I am exaggerating, that last example was something that my son-in-law went through. Oh, and it was for a temporary, 6-month position.