Tests

Ensure new_cmd is always defined #19931

Job	Run time
Test mypyc suite with 32-bit Python	9m 9s
Test suite with py311-ubuntu	9m 40s
Test suite with py314-ubuntu, mypyc-compiled	13m 53s
Test suite with py310-ubuntu, mypyc-compiled	14m 10s
Test suite with py313-ubuntu, mypyc-compiled	13m 57s
Type check our own code (py310-ubuntu)	1m 42s
Type check our own code (py310-windows-64)	2m 26s
Parallel tests with py314-ubuntu, interpreted	22m 21s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 16s
mypyc runtime tests with py310-ubuntu	5m 2s
Test suite with py312-ubuntu	10m 8s
Test suite with py314t-ubuntu, mypyc-compiled	16m 12s
Test suite with py314-windows-64	27m 0s
Formatting and code style with Black + ruff	2m 1s
mypyc runtime tests with py313-macos	4m 40s
	2h 59m 37s

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