tests

Add `file::rdbuf` method #597

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Run time

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Job	Run time
test (ubuntu-20.04)	22s
test (ubuntu-24.04)	38s
test (macos-13)	35s
test (macos-15)	17s
test (windows-2019)	1m 33s
test (windows-2022)	1m 53s
	5m 18s