add test_warn to basic #79

Job	Run time
test (min, default, ubuntu-latest)	1m 36s
test (1, default, ubuntu-latest)	1m 35s
test (min, default, windows-latest)	1m 49s
test (min, x86, windows-latest)	1m 34s
test (pre, default, windows-latest)	1m 51s
test (1, x86, windows-latest)	1m 55s
test (1, x86, ubuntu-latest)	1m 34s
test (min, default, macOS-latest)	1m 16s
test (min, x86, ubuntu-latest)	1m 33s
test (1, default, windows-latest)	1m 39s
test (pre, x86, windows-latest)	2m 9s
test (pre, x86, ubuntu-latest)	1m 37s
test (pre, default, macOS-latest)	1m 38s
test (nightly, default, ubuntu-latest)	1m 35s
test (nightly, default, macOS-latest)	1m 41s
test (pre, default, ubuntu-latest)	1m 34s
test (1, default, macOS-latest)	1m 38s
test (nightly, x86, ubuntu-latest)	1m 34s
test (nightly, x86, windows-latest)	1m 47s
test (nightly, default, windows-latest)	2m 7s
	33m 42s

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