[12.x] Introduce assertContentType()
for improved readability in response tests
#56204
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This adds a new method
assertContentType()
to theTestResponse
class as a convenient and expressive way to check the response’sContent-Type
header.While you can already use
assertHeader('Content-Type', ...)
, this method improves test readability by making the intent explicit and clearer.It helps tests be more self-explanatory and aligns with Laravel’s focus on expressive, developer-friendly APIs.