* Formal Education: If you attend a fashion design school or program (associate's, bachelor's, or master's degree), you'll take numerous tests and exams throughout your coursework. These will assess your skills in areas like sketching, pattern making, sewing, draping, and design theory. However, these are assessments within a program, not a single overarching test to "become" a designer.
* Self-Taught/Independent Route: If you learn independently, there are no formal tests. Your ability is demonstrated through your portfolio and ability to secure clients or jobs.
* Internships/Apprenticeships: While there may be initial interviews and assessments of your skills, there isn't a formal "test" to gain an internship.
In short: There's no licensing exam or standardized test required to call yourself a fashion designer. Your skills and experience are what matter most. However, formal education programs do include various assessments and exams to evaluate your progress and competency.