Countless are the times I've had to test for validation errors, and countless are the times I've repeated the same code for this purpose. Duplicating testing code is not always a bad thing though, but for validation errors, I don't know, it doesn't feel right. If it is acceptable to test one FormRequest with duplicated code, it's a sin to do that for a whole project.
Essentially, a data provider is a method that returns data that other tests depend on.
Form validation testing is not the only use-case for data providers though.
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